Face up. I have one of the apple silicon cases on the 6s which protects the back and camera.
Agree about the notification LED however the problem with that is it directly copies some android devices.
How do you like the apple silicone case?
I was thinking about getting one. The midnight blue to be exact.
I don't use a case currently because I don't care for dings and scratches on the back. I only use a screen protector.