My own try of custom VESA laptop holder/mount. Printed with PETG they may be a bit hard to slide in at first, but they hold on really good.
I've mounted my Dell Latitude 5580 with these hooks and they hold it in place for around 6 months now with no sign of degradation.

Mounted with M5 bolts to pre-drilled(on my own) profiles.
The drill with thread is easily accessible from a hardware store, it's just the tapping that takes some patience to prepare. Should you need any tips, PM me.

Print setup( 3mf file attached for convenience):
0.4mm nozzle

0.3mm layer height(0.2 for first layer)

at least 30% infill

NOTE:

the profiles are connected to each other with both of angle connectors and M5 bolts for my own peace of mind.