My house is wired all in EMT conduits and metal boxes.
When I mount a new switch to a box I use the middle slots at the top and bottom of the device. There are four ears at each corner of the device. What are those for?
I noticed sometimes they are clipped off?
In fact, I have an exposed box in the garage, one of these guys, and the switches have to be attached to the back side of the cover, these ears are in the way.