brackets/bolts going into the wall?
There is a pitch adjustment that can be done. I don't like the sound of "loose against the wall". Pitch adjustment is somewhat easy, if the mounting plate is loose, it sounds like the installer might have missed the backer. In one year, I have seen ONE this way and it was the front one. It looks like they knew because there was a washer on that bolt...I was NOT a happy camper.
PLEASE do not send questions via Private Message. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).