Hi, I am looking for wall mounted brackets that can secure my Tannoy 603s. Due to the trapeziod shape, I cannot get left to right side clamping brackets & I am having trouble finding front to back because I can't find one that clamps a depth of 6". One shop dealer proposed using the Atacama Matrix brackets, but I would have to screw into the back of the speakers to do so. I would have to make 2 new holes!! Would this damage the speakers? I also believe that Atacama is one of the leading manufacturers of speaker stands & brackets, but the thought of drilling my speaks fills me with dread. My primary concern is would my speakers be damaged ? Please advise.