Having purchased the QS8 and FMB I too have thought about ceiling mounting the speaker. I would suggest that the FMB be used perpendicular to the ceiling and you can still use the original mounting screw in the speaker. This would leave the speaker approximately 2" from the ceiling. And as others have stated I would definately find a stud to put the FMB mounting screws into. I ended up not using the FMB in the ceiling. As was also stated by others, I liked the sound with the speaker 90deg. from my listening area. On the plus side it fills the rest of my room up with sound. Having the QS8 is almost like having 2 M2Ti's in one speaker position pointing at 45 deg angles to each other.
