My roosts are just moderately higher than the boxes so to them it's all fair game.
My LF Cochins do not roost at night. They pile up on the floor while my other coop roosts. Our old nest boxes were a pain. My lower order girls would roost on the front opening of them and make the nest rather dirty. We removed those and use Little Giant plastic nests now. No mice nests in them so far as well.