K.K.
I do not care how "good" a pressure gate is, you have to consider that your childs weight pressed against it, particularly if she tries to use it to stand or to climb over will likely pop it and down goes baby and gate. I know that is not how I want to wake up in the morning.
I suggest that you get the type that screws in for your stair well and fix the holes when you move. Most people purchasing a home understand that and you can explain that they will be repaired when you leave. Who knows, they people who end up purchasing the home may pay extra for you to buy new gates for your next home and have you leave the gates for their precious bundle of J....
Good Luck...;-)