I think as long as you don't cover the speakers, all should be good. Plus, as long as the TV doesn't stick out too far from the wall, to block the sound, you should be fine. I'm sure others will be able to give you some advice as well. Good luck.
There’s an L shaped couch, but it’s usually just me and my wife and I directly centered watching tvHow far off-center do you have regular seating? If you have regular seating that is going to have one of the speakers blocked by the far edge of the TV, then that will be noticeable in that seating spot.
This would likely cause some diffraction of those two speakers. However, if your center remains unobstructed and your usage is mainly movies/TV, that is very unlikely to make much difference since 60-80% of the output comes out of the center not the L/R.I would LOVE to upgrade to a 77 inch, but it looks like the tv would come basically flush to the speakers on both sides if it’s perfectly centered.