I've heard of several people using a fan on their M.2 drives. Jerry from Barnaclues Nerdgasm has a heat sink on his from pudget systems with a fan pointed at it, Asus has a file to 3D print a fan holder, the video Linus just released shows the Dell XPS 27 with one.
My question is, should I get one for my M.2?
What kind of fan?
How should it be mounted?