Screwless and seamless cover plate and cover plate assemblies that comprise one or more retention members that selectively engage and substantially conform to the outer surface and edges of an electrical outlet or switch, or audio, data, or video plug, cable, or connector, to releasably secure the cover plate sub-assembly thereto

1. A cover plate assembly for at least one electrical outlet or switch, or audio, data, or video plug, cable, or connector, contained in a receptacle box, the cover plate assembly comprising: (a) a cover plate sub-assembly that is attachable to at least one electrical outlet or switch, or audio, data, or video plug, cable, or connector, via at least one mounting connector; the cover plate sub-assembly comprising: (i) a cover plate comprising outer edge portions circumscribing a generally planar body portion that lies between the outer edge portions in a first plane and that has a generally planar back surface disposed parallel to the first plane: (ii) at least one opening in the cover plate that is aligned and sized to allow access to the electrical outlet or switch; and (iii) one or more retention members disposed adjacent to and fixed to the back surface of the cover plate within the at least one opening in the cover plate that are aligned and sized to allow access to the electrical outlet or switch, wherein the retention members extend from the cover plate in a second plane substantially perpendicular to the first plane, wherein: (A) the one or more retention members selectively engage and substantially conform to at least a portion of an outer surface of an outer edge of the electrical outlet or switch, or audio, data, or video plug, cable, or connector, to releasably secure the cover plate sub-assembly thereto, wherein the outer surface of the outer edge is perpendicular to the first plane of the cover plate and the outer surface of the outer edge is adjacent to the cover plate retention members within the at least one opening of the cover plate; (B) the body portion of the cover plate, when releasably secured to the electrical outlet or switch, or audio, data, or video plug, cable, or connector, covers the electrical outlet or switch, or audio, data, or video plug, cable, or connector, except for the at least one opening in the cover plate that is aligned and sized to allow access to the electrical outlet or switch, or audio, data, or video plug, cable, or connector; or insertion of an external electrical, audio, video, or data plug, cable, or connector into the electrical outlet or switch, or audio, data, or video plug, cable, or connector.

2. The plate assembly of claim 1 , wherein one or more of the retention members of the cover plate assembly include at least one portion that at least partially extends into and conforms to one or more openings or ridges defined by the outer surface or edge of the electrical outlet or switch, or audio, data, or video plug, cable, or connector, for selectively attaching and/or engaging the back surface of the cover plate, such that the electrical outlet or switch, or audio, data, or video plug, cable, or connector openings and the one or more openings in the cover plate are aligned and sized to allow access to the electrical outlet or switch, or audio, data, or video plug, cable, or connector; or insertion of an external electrical, audio, video, or data plug, cable, or connector into the electrical outlet or switch, or audio, data, or video plug, cable, or connector, through the one or more openings in the cover plate.

3. The plate assembly of claim 1 , wherein one or more of the retention members of the cover plate include one or more engagement surfaces that interface with one or more surfaces or openings or edges of the electrical outlet or switch, or audio, data, or video plug, cable, or connector.

4. The plate assembly of claim 3 , wherein one or more of the engagement surfaces of the retention members are at an angle relative to an inner plane of a body surface of the cover plate.

5. The plate assembly of claim 1 , wherein one or more of the retention members of the cover plate include an arm portion having a first thickness, and an end portion having a second thickness greater than the first thickness; or wherein the cover plate sub-assembly further comprises one or more second retention members that conform to the outer surface or edge of the electrical outlet or switch, or audio, data, or video plug, cable, or connector, and that lie in both parallel and perpendicular planes to that of the cover plate back surface.

6. The plate assembly of claim 1 , further comprising openings in the cover plate to accommodate one or more selected from the group consisting of a light switch, a light dimmer, a light or electricity control panel or touchscreen, or sound, wifi, infrared sensors, receivers or transmitters.

7. The plate assembly of claim 1 , wherein (a) one or more of the electrical outlets or switches, or audio, data, or video connectors are at least one selected from round, rectangular, or square shaped on a surface perpendicular to the outer surface or edge of the cover plate; (b) are separated from each other at the outward facing surfaces or ends, or (c) are combined as a single unit with two or more the electrical outlet or switch, or audio, data, or video plug, cable, or connector with a single rounded, square, or rectangular shaped surface that is perpendicular to the outward surface of the outlet.

8. The plate assembly of claim 1 , further comprising mounting holes or connectors of a mounting or strapping plate that are provided at one or more of the end, side or middle portions of the mounting or strapping plate; and wherein the mounting holes or connectors align with the mounting holes or connectors of a back surface of one or more electrical outlets or switches, or audio, data, or video connectors, or housing or receptacle box.

9. The plate assembly of claim 8 , wherein the mounting or strapping plate is connected to the electrical outlet or switch, or audio, data, or video plug, cable, or connector, receptacle box, or wall using a screw or connector that also connects the electrical outlet or switch, or audio, data, or video plug, cable, or connector to the receptacle box or wall.

10. The plate assembly of claim 1 , wherein planes of surfaces of a mounting or strapping plate and/or the cover plate are parallel in the range of 0-10 degrees.

11. The plate assembly of claim 1 , wherein a footprint of the cover plate is larger than that of a strapping plate or receptacle box to cover any gap between an edge of the receptacle box and an adjacent opening in a wall surface adjacent to the receptacle box when installed.

12. The plate assembly of claim 1 , wherein the edge of the cover plate extends between the cover plate and an adjacent wall to cover any gap between a cover plate edge and the adjacent wall.

13. The plate assembly of claim 1 , wherein a shape of an edge of the cover plate is selected from the group consisting of rounded, curved, angled, concave, convex, raised, stepped, square, beveled, routed, etched, lined, engraved, and any combination thereof.

14. The plate assembly of claim 1 , wherein a surface of the cover plate is dyed, colored, painted, printed, clear, transparent, clear and back painted, coated or printed, wall-papered, rounded, curved, angled, concave, convex, raised, stepped, square, beveled, routed, etched, lined, engraved, and any combination thereof.

15. The plate assembly of claim 1 , wherein the cover plate further comprises a spring mechanism and hinge to open a cover attached to a mounting or strapping plate or receptacle box.

16. The plate assembly of claim 15 , wherein the spring mechanism and the hinge are provided in a second cover plate provided over the cover plate and attached to one selected from the cover plate, the mounting or strapping plate, the housing or receptacle box, and a wall surface adjacent to the second cover plate when installed.

17. The plate assembly of claim 1 , further comprising a mud ring or raised device plate provided between the cover plate and a mounting or strapping plate, wherein a mud plate is of a thickness that makes the back of the cover plate flush with an exposed surface of a wall adjacent to a plate assembly when installed.

18. The plate assembly of claim 1 , wherein a combined thickness of the cover plate and mounting or strapping plate is less than one selected from the group consisting of ¾, ⅝, 9/16, ½, 7/16, ⅜, 5/16, ¼, ⅛, and 1/16 inches.