This was a custom solution I made to attach a PNY Nvidia Quadro K620 heatsink and fan to a JSAUX backplate for a Steamdeck.
It requires small screws to attached from the underside of the backplate, which I drilled tiny holes through in the right positions.
Printed with PETG on a Creality Ender 3 V2 and sliced with SuperSlicer and some tuned settings I worked through.