I agree there is probably adaptability here. If I were at the cutting edge of innovating on this, though, I would want to eliminate that variable if I could. Plus, in the long run, the camera will still need to be at eye level, because the world is designed for ordinary people whose eyes are there. Even if you could adjust to having your eyes on your belt buckle, you still wouldn’t be able to walk up to a workstation, sit down, and get your job done.