I have tried a few different orientations.
Curious why u would flip it upside down..
For macro, flipping the monitor down towards you leaves your sightline to the lens open which helps in finding smaller subjects.
It also helps the balance of the rig as I found when pulling light arms far forward with stix floatation added it unbalances the tripod somewhat.
For certain wide-angle shots it is nice to look down on the monitor. For example if you want to shoot up at the surface you don't have to get under your camera to frame the shot.
Same with swimming through / above a reef. You can hold camera below you to get a better angle, without worrying about disturbing the bottom or sensitive life.
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