Four stainless cables and turnbuckles to angle it is what I would use. Run a stick of oak or other hard wood from end to end, two inches longer than the speaker on each end; one at the rear and one at the front over the threaded inserts for the stands. Secure the hard wood strips with some cap screws into the threaded inserts. Run the cable through the ends of each board up to some lag eye bolts into ceiling studs. (not that I'm actually considering buying two 180s and hanging one smile )