does anyone have a gate at the top of their stairs that's pressure mounted, not drilled in?

I would like to put a gate at the top of the stairs so LO can go between her room and the nursery on the occasion that I'd be up there (nursing, bathtimes, etc). we're more often downstairs.

however, we are renting in a really, really old house with weird plaster and drilling into the wall really wouldn't be any more secure than pressure mounting. but I don't know if that's even okay to do?