General-use wall-mount for various things, can either be stuck to wall using tape, or by using screws. 

• Can be used from both sides, either the larger part goes to the wall, or the smaller one. 
• There's a 0.5 mm difference in height, so that one part easily slides behind the other, no matter which one is attached to the wall.

Kudos to @coryMakesThings. Got the idea of the simple wallmount from his model, but redid it from scratch.