Are you saying the cable will be visible when you open the door?I not remember now if where doors hinges are, there is a pair of grommets like the Veloster have:
So this is my first time actually working on a car myself. I read a lot of good things about the JB4 and was pretty excited to find that it works with the Veloster N. I've never installed anything like this before and considering there is little to no info about the Veloster N out there I was...n-cars.net
If them are there, you already have a solution: pass the cable behind the fender and between body -fender sponge (with some anti friction protection like snake skin cable sleeve), routing it to the hole.
I did it like that in one of my last cars, and without problems for 4 years.