The Fusion 360 archive (.f3d file) has a pair of parameters (x_offset & y_offset) that allows you to reposition the PSU inside the case (see image). There's not that much moving room in the case, so watch out for hitting the other supports or covering the mount screws. I didn't want to cover the other supports because I use them for mounting other equipment in the box.

Compatible with 150mmx50mm m4 mount PSUs. (e.g. CUI VGS-350C, Meanwell LRS350, Mornsun LM350, …)

Hardware:

• 4 x M5 - 10mm self taping screws if you don't have threaded inserts, machine screws if you do. The ABS boxes are generally the ones without threaded inserts, but you can add your own if you like.
• 4 x M4-0.7 x 7mm + up to the max depth your PSU allows (check the datasheet), for the Meanwell LRS350 it's 3mm. I use 10mm for mine.
  WARNING: Don't go deeper than the datasheet depth or you may destroy your PSU / self. Remember to account for any changes you make to the model scaling.

The mount cups are a little oversized (+0.5mm radius) because the tolerances on my boxes aren't very tight.