UPDATE! See my V2 version which has a bit more of an air gap for cooling purposes.

-Got a PS4 Pro recently and wanted an under desk mount because I don't have enough table space. Saw several other mounts out there, but decided to make my own.
-I left a small gap above the mount to allow for a bit of an airspace.
-Mounts are about 4.5 inches long which is pretty much the max for my Monoprice Select mini.
-Printed at a fat layer height because I didn't care about resolution. Still took most of my life to print two of them in one go.
-Printed vertically so that I wouldn't end up with the weight of unit pulling against laminated layers.
-Printed with 100% infill so it would be as strong as possible.
-Left a bit of play between the tangs which engage the PS4 Pro and the arms which slide beneath the unit so that it wouldn't be too tight a fit.
-I was concerned about overall strength, that's why I made the mounts with a .187 wall thickness along with some buttressing at the top to resist flex.. I'm thinking you'd have to have about a dozen PS4 pro's stacked up to break these.
-Screw holes are .180 in diameter with a clearance hole of .400 diameter for the head.
-Sorry for the crappy cell phone photo of the mounted unit. I'm quite ashamed of its terrible quality but I'm too tired to do any better today.

Monoprice Select Mini

Doesn't Matter

No

.2625 (.010ish)

100%

Print vertically so that you don't have the PS4's weight hanging on a layer seams. Makes the whole thing quite a bit stronger.

Solidworks