I free range some of mine and they roost in a large tree that is very close to the house. I have not had large predators get into my pen, although I had some young go missing in it. I did haul a very large bull snake out of it this summer. So the snake or rats were getting young stock in the coop. I had one of my cats bring a very large rat to the house that she caught, this summer, & and she carried in up from near the coop.
I lost one blue hen that had gone to nest over 4 eggs-I think that loss was due to a fox. The fox met his demise, from, I think, my dogs, about 2 months ago.
You can lose them from, predators, your own or neighbor dogs, disease, environment, running away, etc. There are risks of loss, in the strangest of places.
We are in an area that has prairie rattlers. The peas are known for eliminating small snakes and
the peas alerted us to this snake that is no more either...
https://www.backyardchickens.com/forum/viewtopic.php?pid=7294757#p7294757
I have not seen them eating them, but word is they do. Beside the prairie rattler, we have buul, red & green racers.
You can pen them to protect them, or free range. I keep the new ones penned until after breeding season, or I may keep my most cherised ones penned until I feel they may be safe. The ones that roostin trees may fall victim to owls or hawks.
I love seeing the ones I have out and about. There are 6 that are out, and there have been times that I couldnt find them, but towards the end of the days they do wander clsoe to the house.
I am a couple of miles from a small town, and I often hear coyotes nearby at dusk, but I do have dogs, but they do sleep in the house at night.
Like MinxFox says, there could be trouble no matter what you do. Life is a risk, and you just have evaluate the risk of loss with them. Good luck.