I've heard good things about Hella Horns.
Funnily enough, I was looking at horns today as well. Unfortunately, you'd have to splice the wiring to the horn (Not so hard, because you only have a + and a - cable); because Hyundai makes the horns actually plug in to part of the harness instead of using covered spade connectors.
From what my parts diagram show is the '19 N-Line (My VIN inputted into the system) only has the Low Horn (probably why it's wimpy), which is mounted on the Radiator Support on the driver's side (LH). Hyundai doesn't offer the opposite side to connect a pair of wires to have as a "Plug & Play", but who knows you might be able to find one.
Attached is the Horn connector picture off Hyundai's Repair Harness List, and the connection diagram.
If you find anything, let us know.