Underside PSU mount for Prusa's Black PSU

This is a remix of https://www.thingiverse.com/thing:3349588.

I wanted to mount the black PSU for Prusa MK3S+ to the underside of my Ikea Lack enclosure. I used the original mount for my Ender 3 V2, and I liked it so I remixed it to fit the Prusa's PSU.