The image flip can be turned off and it's not intrusive. I haven't had it flip on me unless I was tipping the camera to the extreme. How you describe your use of the camera is exactly why I have it set this way. It's really easy to adjust in this orientation.
I have the camera's built in screen turned off and I can get to the buttons and dials just fine. Attached are some bad iphone pics to give you an idea. I have the tilt adjust in several positions. It adjusts easily underwater. Positioned behind the camera it's less of a sail in current, but it still creates drag.
Thanks for the images, really helps appreciate scale.
Looks like an extra long clamp, and that the monitor can swing into a few different orientations easily.