After trying different power supply mounts on here, I couldn’t find exactly what I wanted. A little bit of time in fusion and here it is.
Both mounts are identical except for the lip on the one that attaches to the back of the Psu. I printed 4 walls and 20% infill in Sunlu Pla+. Probably stronger than it needs to be, and a firm fit. Fusion file included.
Print with lip down with no supports as in the last pic. Hope it works well for you.
The author marked this model as their own original creation.