I'm trying to get started buying/setting up a new coop and run. We live in a suburb of Phoenix and my chickens were taken by coyotes. Trying to predator proof everything before getting new. We have tall block walls, and my run will need to go behind or under my trees for shade. There is 4 ft behind the trees of clearance. I was considering the omlet cube coop, but need a large prefab run. (I'll add hardware cloth and apron.). It could also be an l shaped run. Any prefab ideas? Predators around here are coyotes, hawks, owls, and bobcats.