My HT is a 7.2.4 setup. My rear surrounds are bookshelves mounted on brackets. I'm thinking of getting the SVS Prime Elevation Speakers to use them as the rear surrounds. I see that placement is almost flushed to the wall. It's rear-ported so doesn't that create any problem with wall mounting? Shouldn't there be a few inches of clearance between the wall and the port? Also I'm also using in-ceiling speakers for my 4 atmos speakers. Is it really better to use cabinet based speakers? Thanks.