This is a switch cover/protector for decora/rocker style switches primarily when used with screwless plates or I suppose if you just want to use double sided tape.

There are three different styles, one with enough depth for velcro tape (such as the Command strips) plus a couple with enough depth for double sided tape such as gorilla tape.  Since I had a couple different thickness tapes on hand I made a couple variations, use whichever suits the tape you have.  The 0.8mm plate should be sufficient for most tape without leaving much of a gap.