They'll want to go to "roost" together. IMO, it's better to put the heat plates right next to each other to keep them from battling for space under oneNo electric in the coop, and it won't be available for the little ones until I deep clean. I'm rotating flocks so my old girls need to go to my friends and I need to prepare it for the babies.
I like the binder clip idea. I might go with that. I'll do a heat plate in each, and probably food and water in each to start?