Dig Quad LED controller mount for a 12, 10A power supply, with a side relay board capacity.  This model is currently adapted for this power supply (AliExpress Link ), but the included STEP and F3D files should allow you to customize the dimensions for your own power supply and relay board dimensions.  I don't think I've seen any other customizable Dig-Quad mounts out there yet.

In the Fusion3D file, the custom parameters allow for you to set your relay board dimensions and mounting hole dimensions, as well as set the hole pattern and distance on the side of your power supply.  My brand uses a 2 and 1 hole pattern (named in my model with reference to the top surface, one mid-height ("mid") screw near the wire terminals, and two ("top" & "bottom") furthest from the wire terminals.

The parameters of note to modify have a description with * (stars).

This version uses M2 screws to attach the Dig-Quad.  They self-tapped fairly easily for me with the current settings, but you can adjust that as well.

The relay board uses M3 screws to attach, again self-tapping.

The side slot to attach to the power supply is sized for M3 screws to be used (but screws grab into the power supply).

This model is meant to be mounted inside a weatherproof project box, so there is no antenna mount on this model.