Originally Posted by Lazy Bird
...No idea: I'd have to open my computer !

And I'd better leave that to a professional: before you asked and I looked it up on Google, I didn't even know what an M2 slot was 😊!)

Thanks for alerting me to this point though!
If you can post the full specs of the Dell model, I can have a look as the M2 drives just plug in easily, if you have a DVD rom slot you can use that for a SATA SSD bay to give an extra internal hard drive.