That's a superb "sketch".

You'll want to bring the 80s out from the wall and toe them in. You will also probably want to flip the center upside-down so that it is pointing up at you.

Also, you may want to think about hanging your QS8s from the ceiling and angling them towards your couch (three cables). This will give you a cleaner installation.

What's behind your couch? Is it a wall?