We have two of these since the maltese and bichon managed to escape the low gates and wreak havoc in the kitchen..(the rescued bichon...aka naughty little angel...she's the reason why we need gates). These work great in low traffic areas.
In high traffic areas, it's best to screw them in the wall since the gate tends to "shift" with all the opening, closing, and fitting the backpacks and groceries through it. I didn't screw mine into the wall. hence all the shifting. But I really don't want additional holes in the wall when the gates have to be removed in order to fit large, bulky items through.