Ideally you’d put your top fronts at ~-10 as you can’t run top mids and top rears. Needs to have 1 layer between them on the receiver - top fronts and top rears, or top mids and rear heights.
Ideal for 5.1.4 is top front and top rears as per Dolby spec. As your couch is off the wall, you should be fine at position 10/11 with top rears. Especially if you can angle the tweeter to adjust a little as needed.
I wanted to have mine at equivalent of ~ position 11 or 12, but have a stud/beam above the gyprock at that point at the front of the room so the installer ended up putting them 50cm from the wall.
Was disappointed with this, and means he installed my rears 50cm off the back wall as well for symmetry even though I said I didn’t care about symmetry and wanted the rears as far back as possible. But he’d already started cutting before I noticed and so the easier WAF option was to suck it up and accept the less than ideal placement t rather than have a 8” hole in ceiling patched and repainted.
Ended up having to get an installer in to help wire the cables out through floor, under house, up outside of house in a weather proof conduit, and the into crawl space by drilling through side of outside wall.
All that said - while less than ideal placement, still sounds great and I haven’t had any moments where my ears have said “that sound should’ve been coming from further back” most atmos content seems to be wind/rain/shrapnel showering down etc that isn’t very fussy on location, at least from the 10 or so movies and shows I’ve watched in atmos