We recently bought a new microwave when the old one bit the dust.
The new one is smaller and lighter than the old one. Because of it’s light weight and because we placed it on a slippery counter top, it wanted to slide every time we opened the door.
An east fix was to cut a piece of non-slip shelf liner and place a piece under the legs of the microwave.
Turns out we had to put a piece under all 4 legs to keep it from sliding when we opened the door, but that was a lot cheaper than going back and buying a larger microwave.