I have the same issue here. I live on the top of a hill, and the only flat ground is at the bottom. Although, I have had chickens for 2.5 years now. I have some chickens that live in my garage, which I do NOT recommend, but placing them elsewhere, I have been pretty successful. Here are some of the things that I have done, which may or may not be an option where you live:
1. Place a coop right next to your house, and allow them to free range (you do not have to let them free range, but I would let them out every once in a while).
2. Place a coop and run on the flat ground available. Make sure the coop is strong and sturdy, and make sure it is built out of strong materials. Before placing the coop, put chicken wire on the ground and cover it in dirt (trust me, this will save you lots of money, time, and chickens in the long run). Just place enough for the coop and run to sit on with about a foot off of each side. This will keep animals such as foxes and coyotes (possibly raccoons) from getting in. Also, make sure that there is a strong, sturdy cover over the coop (such as tin or other metal). The run is not as important as the chickens sleep in the coop, so I would just put bird netting over mine to protect them from hawks/owls.
3. Lastly, I would board the bottoms of the coop and run about 6 inches. This will save many of your chickens from being beheaded by predators.
**Note**: If the flat ground is prone to flooding, you may need to elevate it. Wet environments allow mites, fungus, and other bad things to come in contact with your chickens.
I am no professional, but believe me, I have experience. I have practiced trial and error, losing close to 80 chickens, 32 turkeys, and 20 ducks, but after gaining this knowledge, I have not lost a chicken or anything else in six months. If predators cause any problems, it's nothing that traps and/or guns cannot take care of. Where I'm from, the biggest threat to my chickens is raptors (hawks, owls, etc).