Ok, so I've looked all through the threads, and can't find some of what I'm looking for... so here goes: I'm wondering if I put my nest boxes 18-24" off the ground, how high do my roosts need to be? I know they should be higher than the boxes. Will I need a ramp or ladder for the chickens to get on/off them safely? I have BAs, BRs, NHR and GSL.