So, you have two chickens that you neglect aside from feeding?
Keep them confined. If they seem like they aren't happy with that, that means they need more enrichment, not more space. Enrichment comes in the form of things to scratch in, things to eat, things to peck, basically everything that they would find free-ranging. Just throw in some weeds and novel foods on a regular basis, give them a few things to hop on, and they should be happy. Chickens are not complicated creatures.
When you own an animal, it is your responsibility to keep it confined to a place where it will be safe. Cats, dogs, chickens, anything. With the possible solo exception of homing pigeons and the understanding of the risk to them.
What happens if a stray dog goes after one of your birds? If someone sees them, thinks they're strays, and decides to have a chicken stew? If a raccoon -and there ARE raccoons in the area, I guarantee it- finds them? Raccoons live in big cities packed with skyscrapers, they're amazingly adaptable to humans, they ARE in your area no matter if you're near an urban area. What about a fox fox? If a possum comes up while they're too sound asleep to be aware? Do you have hawks in the area? Owls? What happens when your neighbor steps on a hidden egg for the fifth time and decides to pick up a pellet gun? When one goes broody too far away from food and her health suffers for it?
Besides that, you're going to have a hard time getting close enough to inspect them for disease on a regular basis. The more ground they cover, the more birds they encounter, the higher their chances of catching at least one disease. Forget trying to treat them for mites when you have no idea where they're getting the mites.
In short, you're being irresponsible, and your birds are going to suffer. Confine them, and bring the enrichment to them. It's much safer, and runs much less risk of bothering any of your neighbors.
