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They will. Check out how this old school chicken house did their roosts. https://www.lsuagcenter.com/~/media/system/7/e/f/d/7efdf97e28e22b6c92d57a9cb02ceb6e/7402familysizelayinghouse.pdf 2 foot 6 inch roost length, repeated many times along the back wall of the coop/house.

Only drawback to having all roosts at same height is the space it takes to have the same linear footage. Think of your ladder. Leaning in on the wall takes way less (horizontal/floor) space than laying it down horizontal. If you have the space, I prefer all roosts to be at the same level.