Side note: I purchased this Anker 49.5W PowerDrive Speed+ 2 [Amazon link] which had a dedicated 30W USB Power Delivery port. However I didn't do enough research (no PPS tech and it's not Power Delivery v3.0) so it's doesn't even charge beyond 18W.

I tested it the stock Samsung USB-C that came with my Note 10+.

I'm certain Anker and everyone else will be releasing PPS-rated chargers in the coming weeks. It's an thin market at the moment.

Is this one a good car charger?

This car charger from Anker seems to be working for me. https://www.amazon.com/gp/product/B071WYF9HP

Haven't charged all the way from empty to full yet, but was working (flashing, reporting charging, gauge going up) while I was in the car.