I am looking at mounting my sonos ones to the wall behind my sectional couch. I will, of course, be using them for surround sound for music and especially movies. I am looking at the Flexson wall mounts so that that way I can mount them upside down and have access to the controls if need be. I will be mounting them about 7 feet in the air or so. The Flexson mounts swivel down 15* and side to side 40*. Will this be enough down angle to still get superior sound for what I want to use them for? I like the looks and features of these mounts compared to some others, but not sure if they will be the best. There are other mounts out there that have more swivel and angles for the speakers. Just want to see what everybody has and their thoughts on them. thanks.