I can't say for your area but in virginia turkeys don't mind hills at all. When I have hunted the George Washington National Forest which is western rugged part of virginia all the turkeys head to the ridge lines. This is some rugged mountain country and they strut right up the mountains and hang out before going back to roost. I hunt mostly farm country and kill them in dense woods. Except when it rains and they head to the fields to have better vision and security.
Good luck!