What position do you guys usually shoot in? The only one bad thing about the OM2, in my opinion, is that you have to re-balance the phone when you switch back and forth. That takes a little time in-between your shooting. There are a couple phone gimbals that I've seen where you simply just turn it and no re-balancing needed.

Horizontal is how Video is meant to be viewed in my opinion.

Horizontal is how it's meant to be SHOT.  Here's a video that I did to explain the difference: