In my lengthy career as an architect, one of the things I learned is where to put the doorstop so that the doorknob does not hit the wall. Most folks think it should go on the baseboard at the bottom of the wall. However, the doorstop — and it should be the solid-steel type — should go on the door so that it hits the baseboard. My preferred position is 2 in. above the floor and 2 in. in from the strike-plate side of the door. In this position, it is never in the way of floor-cleaning equipment.
Sam B. Lewis, Lockhart, TX