I wanted a low profile mount for my philips hue dimmer switches that is easily removeable if I need to repaint the walls or wanted to change the switch out for whatever reason. This model is meant to fit underneath a typical light switch cover plate and is held by friction when the cover plate is screwed in.
I also have a similar model for Aqara switches here: https://www.printables.com/model/286300-aqara-switch-cover-mount
The author hasn't provided the model origin yet.