Nesting box up grade
Chickens also think in practical ways as well. Ground level easier to enter. 12 chickens can do well enough with 2 or 3 nesting boxes. If the chickens start to lay eggs HEAVY DUTY, LOL, then you may find 2 hens in same nest at same time. Good reason to make nesting boxes larger rather than smaller. 12 x 12 x 12 is on the minimum size.. 16 x 16 x 16 is more ideal size, for standard size hens. If you have banties, then smaller nesting works fine as well. Many peeps suggest to place nesting boxes elevated from the floor lets say 12 inches above.. Reason........ To keep chickens from scratching and flinging the floor litter into nests.
WISHING YOU BEST