Sorry for the late reply, looks like you've decided on a fence. But if you're still wondering our yard is sloped and is actually kind of tri-level, and it still works perfect. Out front lawn is about 15' lower than the front door of the house and that was the place we needed to keep her close...
We have a PetSafe wireless fence, it just makes a perimeter from the transmitter in a circle. We have set it to the max at 90' which is a 180' circle around the house. They cannot run across it like at buried wire fence and it worked great with our dog. She eventually learned the perimeter and...
Noisy picture, but unedited and maybe the wildest skies I’ve seen in a long time. We’ve finally been getting some moisture out of these clouds down in SW CO.