This is a quick drill hole template to place wall anchors to mount my Dayton Audio B652 speakers using Adjustable speaker mount: https://www.thingiverse.com/thing:3156450

I placed the mounts centered and against the far edges of the speaker back as shown in the picture. Used counter-sunk screws to screw the mount to the speaker backing (the speaker is soft particle wood). The edge to edge spacing between the speaker side mounts is 11" but the wall side mounts are slightly narrower so I made this template.

It keeps the brackets arms parallel, spaced the right distance, and gives you an easier way to level the speakers mounts with a laser level.

I included the f360 file, sorry the design wasn't setup to be fully parameteric.