Great area for free ranging. For the chickens you don't have to clean it.

You probably have a chicken missing from time to time if there are predators. But we can't predict if or how many losses you will have.
I had no losses at all in the past 5+ years, letting my small chickens free range a couple of hours during the day. I keep them locked up in a coop with secure run at night. In the morning they are free to step into a descent run with netting on top through a pop door with a chicken guard. When I am around the house i open the run door to let them free range.
My chickens flee when they see a dog and seem to know a neigbor cat is not a danger for them. They are good in hiding and can fly a bit. We don't have many predators here that hunt during the day. Just a fox now and then, and also hawks are spotted not far from here. But I always check if they get home because I know there is a risk when they don't come home.
If you choose to let them free range its important to choose a breed thats fit for this task. -> not white, heavy or pet chickens.