There's similar questions online that were asked.
Is there a way to lean a mirror/board against the wall and ensure that it doesn't slip without hammering a second piece of board on to a wall top of it? I've tried learning this mirror on a piano and for some reason that works, but I need a solution for a home without a piano. I can't afford making holes in my wall. This is also unwieldy because that means my mirror is fixed and I have to re-hammer in a board every time I move the mirror.
I don't trust grips on the bottom of the mirror to preventing it from slipping if I touch it. I don't trust corrugated rubber matts or changing the carpet.