Won't need the brackets for QS4's or QS8's. They come with their own brackets which mounts them flat on the wall. (Just need to make sure they are mounted properly. I've heard you need to bend the bracket out a bit so it's not flush with the wall at the top). They are meant for the bookshelf series M2, M3, M22. The on-wall series come with their own brackets also.

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing