if they are on the same wall?...and how far away from the wall should they be?..and...how much clearance from the celing should they have?..we will be adding the roots soon..so i just wanted to check before we installed them..and have a problem later on..thanks..Wendy.....p.s...i'm not sure..but i think my breeds are pretty good size...RIR, sex-link,white rock,hamburg,lakenvelder