I think it looks great. Even if you spread out the 60's a little more, which you may not have to, I don't think the couch will be an issue. The tweeters and midrange are at the top of the speaker, and the woofers won't really be affected as much because of the lower frequencies. Besides if you look at a picture of the 60's, the woofers are a little higher than the 80's.
The Q's should be fine as you will adjust for distance (delay) when you setup your receiver. Also, they are very forgiving. You may find that the 500 works better moved away from the corner a bit...
