As to which, QS4 or QS8, if your room is of fair size, and can afford it, go with the Eight.. I'm sure the Fours are great, but the 8's have a the edge with upgraded speakers and tweeters..
Hanging them is really simple.. The '4' at 5.5 lbs or the '8' at 11 lbs, no biggier either way.. Just go to Home Depot or Lowe's, and pick up a little pac of "EZ Anchors"..
Believe me, these things really work, and are so simple to use.. All you need is a Phillips screw driver.. They are not expensive at all, small in size, finish off flush with the wall, and can hold up a baby grand piano if needed.. You will only need two or three anchors per each Axiom provided bracket..


LFE ! The rest is just details..