OK I am debating whether to make a roost rack with two roost bars spaced 12" apart at the same height or would it better to stagger the height with the higher one in back (12" difference in height, 12" spacing between the bars front to back). Is 12" apart enough space between them to hopefully keep them from crapping on each other and to make them comfortable too? Sorry for all the rookie questions. Just trying to do this with some knowledge. My bars will be 6'-8' long with a poop board under the bars. Total number of birds will be 12 at the most at any one time.