I need to mount 6 lbs speakers from the ceiling but hte position may be such that there is no ceiling joint to attach the ceiling mount to. I was thinking of using Omnimount ceiling mounts since they are inexpensive compared to other mounts I"ve seen. However, I'm not sure with this ceiling mount (or any other one for that matter) if it is okay just to attach to the ceiling drywall, and not to a ceiling joist. I may be able to get one of the screws that attaches the mount to the ceiling into a joist but that's all. I've read the omnimount installation manual on their website, but I think someone just scanned it in on their side, because I can't makeout some of the text. Thus I can't tell if this will be ok or not. Thoughts?