Ikea STYRBAR wall flush mount holder

This holder is a drop-in replacement for the original switch on -I assume- a European flush mount. None of the models I found was compatible with this system.

The whole mount is 82x82mm. The switch goes in firmly without using magnets or double sided tape. It's symmetrical, so you can mount with the best looking side up:-)

One of the photos about the wall mount where you can install it

Update:

Uploaded some photos and screenshots of the double mounts and the physical switch accessory you can attach to some of the models with a screw.

Some Cura settings I used:

20% infill
0.16mm Layer height
Using adaptive layers
No supports (except for the physical switch holder)