Is anyone appendix carrying a PPQ M2? What holster
are you using?

I don't have a PPQ M2 but my go-to holster when carrying appendix is The AIWB holster from JM Custom Kydex. There's a solid two month wait time for them though.

Go here:
KSG Sidekick

I carry my P99 in the sidekick.

Works great, and Gabe is THE fastest holster supplier around.  You'll get a custom holster in a week to ten days.
The quality and workmanship is impeccable!

I've got a JM Custom Kydex AIWB w/Wing on order for my P99; I have one for my P320 and love it.

I have a Comp-Tac 2'Oclock for my PPS M1...honestly I don't recommend it unless you have a perfectly flat stomach. If you have any kind of a paunch it'll tend to roll out, and forget it if you're a fat guy like me It pains me to say that because I really like Comp-Tac products...

Well, that is if you wear it on your waist...if you wear your pants low, it might work out better.