I have standard chickens and plan to run a roost along the 10 ft side of my 8x10 amish shed. How far from the wall (maybe 20 inches?) would I have to put the roost so poo wouldn't drip/spatter so much on that long wall? Because there is so much framing in there, it seems like that long back wall would be hard to clean. Sorry if this is a dumb question.