what do you think about mounting the BT15 center mount to drywall using "wall anchors", the kind of screw that has a housing that spreads out behind the drywall, thus holding it from behind....

The anchors are damn solid.  My only worry is, would the 22lbs of the 5C bow out the drywall?

There's a stud directly in the middle of the two.  I wish the B15 had a bar connecting the two, then i'd simply add a screw in the middle into the stud...

My other thought was to mount a piece of 1/4" thick plywood and mount the B15 mounts to that...