Despite some initial reservations about cost, I am opening up to using SongSurrounds, but I totally forgot to look into how they wall mounted. It looks like they don't. Is that correct? How about ceiling mounting? (for what I'm looking at, the side surrounds need to be wall mounted, but the rears might be ideally ceiling mounted) If so, how much does it cost to get the custom wall mount ones? How much time would it take to get those?