It is posited that even though you need one nest for 4 birds, they will all like one. If you have one nest, they will lay on the ground. Pthaw. They can carry them under their wing. Be careful picking them up from a next, they will drop the egg.
I pick up any recalcitrant chicken, hold it up at eye level (watch out) and say "I am a-gonna eat you!". I get the one-eyed stare and they behave. It works. Really.