I've never read the pdf LondonCalling referred to. When I got the OW, they included a T-shaped bracket. I screwed that sucker into the wall, connected 12 gauge wire to it via the provided "clamps", tightened it using the provided IKEA-style tool and then hung the OW on the T using the built-in hooks. I have my M5s mounted into drywall anchors. I had the M2s mounted without anchors but the M5 'nads are just too massive and may swing to and fro without anchors.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated