Speaker mount adapter

I have these speakers, the mount system is flat on the wall and I want to lead them to the center of the room.

These home theater speakers are made to mount flat on the wall so I made this adapter to fit on this ( https://www.thingiverse.com/thing:2104478) using ½ screw and nut and I can adjust the angle of them. But they can be adapted to more mounts.

Are printed on red PLA 0.2 mm, 215/60 degrees. I made the sections that go inside the speakers a llitle more width and sand them tho have a tight fit.