So this may be a stupid question, but I've read that you're supposed to raise the nest boxes in the coop. How high should I raise them and how do the chickens get in them? Do they just jump in, need a ramp, or use the roosting polls? Lol. Also I have a roughly 4 foot fence around my yard. Will they be able to get over it? I wanted to let them roam the yard for a bit during the day. Thanks!