you'd be best off using 2 pak, including the undercoat. Automotive acrylic will dissolve when you splash fuel on it when you're filling up, plus it's a lot softer and scratches easier.
The spray shop will have no problem doing it with 2k paint, might cost a little more is all.

Yes, any 2 part urethane/acrylic enamel will be fine.  Any paint shop that uses anything else is a joke of a shop.

No real shop will wait around for 1 part paint to dry when they can spray hot and/or bake it.