For those of you with toddlers/preschoolers.....do you have two stools in the bathroom your child uses (one at the sink, one at the toilet), or does the child just move the stool around from place to place?

In the girls' bathroom (upstairs), I plan to put a stool at each sink and another one at the toilet, since the toilet/tub are behind a closed door from the dressing area. I'm debating what to do in the guest bathroom (downstairs) - it's a large, full bath with shower, toilet, and sink, so there's plenty of room for two stools...I just can't decide if it's overkill.