I would like to try this.
To do it, you actually use the Axiom mount "front" plate. You use the screw holes in the plate to attach the angled mounts to the plate. Then you slide the speaker into the front plate. The speaker will fall out on its own, so you have to carefully peel back the black tape/cover on the speaker back to find a corner screw. Remove the screw and put a newer, longer screw in that attaches in some way to the mounts you create. I screwed into the plastic and made a nice clean little hole in the front plate that goes all the way through to the speaker back's screw hole. I did this on only 2 corners.