No way I could go sideways with any mower. I was just glad to hear it was ‘mowable’. I have a large zero turn that eventually will be here (and has a roll bar) but for now, I have a small, tractor style mower. The engine is in the front, the gas tank & my weight is toward the back, so it’s fairly well balanced & I hope that will help. My issue now is getting the nerve up to do it - doesn’t look too bad from the bottom, but sitting at the top edge & looking down is scary - I hate heights.
Our slope that he mows isn’t very big. More of a patch than anything, maybe 10’ x 12’. It’s not dangerous how he does it. I think yours sounds like a bit more than what we have.