At the end of the day you need to keep the wife happy or your new toy's will stop coming into the house. You are however a little low as far as speaker placement goes but I honestly doubt it will hurt the performance to much. I played with location on my old QS8's and it made little diff. I was 7 feet off the ground, then 5, then dam near had them a foot off the floor and it all worked.

Don't sweat it!