We MIGHT be getting chickens. So, I've started planning the coop. We can't let the chickens free range because we have a ridiculous amount of predators.(Everything from hawks to coyotes) I've heard for the run that the wire's suppose to go down 6"-1'. There is no possible way I can dig a trench that deep with all the underground rocks. I could prbably dig 3"-6", 6" being the maxium. Will this be enough protection?