Just moved to a rented house and consequently can't use screws in the walls. Does anyone have any tips or recommendations for pressure mounted stairgates. The gap at the top is a big 110cm, but smaller at the bottom 85cm. Do people use 2 of these things or make do with one? At the moment my son seems disinterested in going up unless I nip upstairs quickly, but shows great promise at launching himself off the top step, given half the chance!