If you need to remove previous "silver" PSU and replacing with new "black" (Delta) one, you will find that you have to remove slide-nuts from top horizontal gap to side gap of printer frame X profile...
This mount leaves PSU unit with small gap apart from printer frame, it will be probably not so perfectly horizontal/vertical positioned in general but holds well.
PLA worked fine for me, 0.2 layer, no support, no raft/brim.
You will need usual 2x M4 nut (stays same as for original brace) - this is not in spares, so you need extra two.
2pcs M3x10 you use to screw it into profile - as removed from silver PSU,
(spare) 2pcs M3x10 + 2pcs M3ns for hang screws
(spare) 1pc M3 x10 screw to screw in hole into PSU through brace in the middle of flat side
The author remixed this model.