There's plenty of contention within the hunting community on this point, but as a general rule of thumb, 3 to 5 feet off the ground is a sensible height. Alternatively, you could try going to 7 feet and angling the camera downwards. In terms of location, try and find a spot in the wild where you know wildlife is frequently active, so you have an excellent chance of capturing some interesting shots. These placements also work well for monitoring flora and fauna for wildlife photography and security.