I have them upstairs much more than downstairs myself, I'd say about 5-1. The best non-posionous solution I have found is to take 2 inch masking tape, tear off about 8 inches or so, and leave it on the floor in the areas where you see them WITH THE STICKY SIDE UP. They prowl around at night, they don't get in a web. If you picked the right places you should catch several on each piece of tape in a few weeks.
I tape up the outside door to my basement room. More often than not, it's pillbugs that get stuck on it.