Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I don’t know if this is the fastest but it definitely works with my 2018 12.9 Pro and my iPhone 7:

https://smile.amazon.com/gp/product/B0721DV7YX/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

Yes this is fine.

The key word you want to look out for when purchasing a USB-C charger for Apple products is Power Delivery. Combine that with a relatively reputable brand (Anker / Aukey / RavPower and of course Apple, along with some lesser known ones like Hyper / Ventev) and you should be good to go.
 
  • Like
Reactions: A.R.E.A.M.
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.