I have a Sonos arc and sub and was wondering what the best placement for the rear Sonos one speakers should be. Position A, B, or C? Or maybe even another location? Do you want them directly behind you or more towards the sides? Should they be angled towards the seating position or pointed straight towards the screen? Also what is the best height to mount them? The couch is 15 feet long along the back so pretty large.
Of the options given, I would prefer ‘B’ or ‘C’, more or less at ear level. The right rear is asymmetric for ‘A’. The nearby ‘A’ will dominate the listener sitting in the near corner of the couch.
It’s a ‘B’ from me. 
I’d go B over C for the slightly wider rear soundstage (with them angled towards the seating position).
I’d say try B and if you don’t hear any problems from wall reflections keep it, otherwise go with C.
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