I have 14 hens, 12 laying. I have 13 nest boxes in two hen house. I get eggs in one box in each house, and hid in the tack room of the barn. So, have one box for each chicken, and then either they will all use the same box, or none at all. Fickle little females!
Well based on advice at beginning we skipped the nesting boxes. Have several inches of pine nuggets in the coop (8 hens in one coop and 7 in another coop). Each day they dig a nest and everyone uses it. The site in the coop rarely changes.