Hi, 

I am thinking about mounting two Sonos one surround sound rear speakers. Do I have the option to mount them horizontally? They will be mounted about 8' up on the wall and mounting them horizontally will allow me to conceal the majority of the wall outlet they will be plugged into. I do not however want to detract from the surround sound quality.  I see that the Sonos One wall mount allows for horizontal mounting. 

Thank You,