Originally M.2 modules are screwed down (M2, M2.5) to a standoff soldered to the carrier PCB.

To remove the Module you unscrew the little screw, module pops up and you remove it.

For prototyping this sometimes is annoying so i was experimenting a bit with a magnetic lock. I use a small Neodym magnet and glued it to the carrier PCB. the other Magnet sits in the little recess in the module. Those magnets, yet very small (1.5mm high, 2mm diameter) are surprisingly strong once they make contact.

Manufacturability is probably low, as they cannot be soldered. Neodym Magnets have a Curie Temp of ~80 degrees Celsius. Around and beyond this Temperature the Magnets looses it's magnetism permanently.