I have fox, coyote, skunk, possum, coon, snakes, hawks, vultures and the odd wandering dog to defend against. My coop is gonna be tied to the greenhouse (16 x 48 overall) and I have 108 ft of 6ft tall chain link panels (some are doors). So this gives me a footprint enclosed by 156 feet of protection. I also have umpteen welded wire dog pen panels. (Yes, I used to be in the dog showing business lol) I can put the panels outside of the main perimeter via the chain link doors, increasing foraging space.
I will run a hotwire about 8 inches from the ground all around the main perimeter. Have lots of hidey spots, will put up fake crows, net the top if I have to. My last flock was wiped out by coon, fox and hawk, this isn't gonna happen again.

I figure I will have enough enclosed run space to qualify as free range. Since all the panels are movable, I can just start on one side and as it gets a bit worn, shift panels around. And the pen panels are ultimately movable, probably easier than the electronet.
The buildings are gonna be as snake proof as I can make them with hardware cloth (gonna take money, I know, but dang). All doors will have double latches with the spring loaded caribeners, all pop doors will have latches on the inside.
I'm telling ya, for what I am going to be paying for the breeds I want, varmints will learn to give this place a wide berth.