I have a 5.1 setup that, for now, uses speaker stands. I'm having the surround speakers wall mounted on Monday. I've read that the angle for surround speakers can be from 90 to 110 degrees. I've attached a photo of one side of my sofa because the 90 degree mark is a door. It appears to me that the wall that is slightly behind the sofa is well within the degree parameters. Does it look ok?