Omnimount makes a mount that some have used for the Qs8's, not sure how much room it allows for the top driver. I used some shelf brackets I got at Menards, I like them as they have a plastic cover that hides the wires. I just screwed it up into the raftors. You could get a stud finder to find your studs in the ceiling.
Most home improvement stores have wiremold or cable raceways with adhesive backing that can be attached to a ceiling. I bought some on
http://www.cableorganizer.com There are various sized available and should come in a color that will match your ceiling, they are even paintable.
Below are some pics of my Q mountings, and one shows the tracking that my Component and HDMI/DVI cables run to my projector. The plastic tracking also worked out as a good divider from my blue HT ceiling to the rest of the room...
