I use one of these mounts on my frame. Easy to move to different locations. I add a threaded selfie stick for height. It doesn't give the over the shoulder view like Bighorn's rig, but it works pretty well.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb