A few years ago i bought a cheap xlr mixer at Thomann.de. Its a cheap basic mixer but there are no brackets available to make it wall mounted.
I created a bracket set you can slide-on. The only downside is that you have to sand off the small feet.
the upside is that its a small quick print and you can easily take it off if you want to bring it to somewhere. The side screw mound isn't necessary to use.
If someone wants a heavy duty version, let me known! I will make a free upgrade!
The author hasn't provided the model origin yet.