In looking over coop designs on BYC, I noticed that a lot of folks described a hardware cloth "apron" and the most common dimensions were 4"-6". Does this mean that they just extended the fencing material onto the ground and outwards and then put rocks or dirt over it to prevent digging predators? We have been advised to line the underside of our coop building with heavy fence material to prevent chewing predators for gaining access underneath....that is if they are able to dig under the foundation to get there. My concern is the actual run. Will this apron design be sufficient or should we bury the fencing?