Anyone have younger kids (2 and under) all napping in the same room? (in their own playpens obviously)

Right now I have them in playpens in my family's bedrooms, but this is a bit of a pain for a few reasons. I am considering putting all their playpens down in the playroom come the fall, when I won't have any older non-nappers that need quiet playtime then. It is a basement, so darkness won't be an issue, but with toys all around, I'm worried they will just freak out that they can't get out to play and not want to nap. Having them all together and able to see and annoy each other and keep each other awake also concerns me. Has anyone successfully gotten multiple toddlers to go to sleep in the same room, or better yet, in a play room? How long did it take before they were all going to sleep easily?