The chickens like ground level nests well enough although they do pick elevated places sometimes when they are free ranging and have lots of attractive choices at all levels.... don’t understand why everyone says nest boxes need to be up off the ground. Ours never have been elevated and the hens almost always lay in them. And in nature they would nest on the ground, so elevated nest boxes dont seem like a necessity to me. They would allow more floor space though, so that is one reason.
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I need the nests to be elevated because I have a lot of back issues.
I liked the idea of the extra floor space under the nests, too, when I designed the coop. They don't use it much. Silly chickens.
I also like that they have several levels so they can get out of the lines of sight of each other.