I bought my QS8s used, without mounting hardware, but I didn't want to drill holes, anyway, and there were pretty good places for them atop bookcases. I got two little kitchen-organizer racks and painted them black, and they sit on the open rails of those. They have about 4" of clearance at the bottom.
VP180, M80s, M22s, QS8(4), CSW S305s, EP500, Pioneer VSX-90
M2i, M3(2), Pio vsx-1020