The Xshot tripod mount iPhone case allows you to attach your iPhone to any tripod in portrait or landscape.
I use it for timelapse videos, self portrait shots, group shots (with me in them!) and more. I have dropped my phone many times, and it has always protected it. The company will even send you more adapter pieces so you can leave them on your tripods if you have more than two.
It comes with a mini tripod that can cling on to poles, rocks, and other surfaces with its bendy legs and rubber feet.