I live in Nashville off of a busy road. My backyard is only partially fenced in. Neighbors cats and dogs tend to get loose a lot and I've heard (but not seen) that there are also raccoons and coyotes about occasionally. What's the best approach to deterring digging predators? I've seen folks bury hardware cloth vertically about a foot down, but I've also seen folks do a "skirt" around the coop and run perpendicular to the structure. What works best?