When I mounted my QS8's I didn't even look for the studs. I accidentally hit a stud with the far right screw in the 'T' with the right hand speaker, the other speaker isn't secured to a stud at all. I think I used sleeve inserts on three of the holes in each 'T', and just screwed the rest in with drywall screws and was done with it. I would imagine I could probably yank the left hand speaker out if I really wanted to, but they are up high enough that the kids can't reach them, so I'm not worried about it. Short of me really trying to dislodge them, I don't see them going anywhere.
