Couldn't find anything less than a 50 pack of these for $500, I'm assuming for large office installs, but I only needed two. Quick and dirty model later and it's ready to mount.
The holes are sized for these anchors from Amazon. I'm not sure exactly what the bolt sizing is, but they're a half inch long. Maybe M8? I countersunk the top of the model so the bracket can sit flush against a wall/ceiling when mounted.
The author marked this model as their own original creation.