For those who haven't yet installed a hitch and are thinking about it, I'd be VERY careful about installing a hitch on a Kia anywhere but at the dealer.
I had a 2016 Kia Sorrento (FWD, V6). I had a hitch installed at Uhaul. I bought a pop-up camper (it weighed about 2200LBS, the tow rating on my FWD Sorrento was 3500, with the same car but with AWD it would be rated for 5k), and the RV dealer had to replace the wiring harness since Uhaul installed a 4-pin harness and my camper with brakes needed a 7 pin harness.
Fast forward about 3 years and my Sorrento was having AC issues that the dealer had loads of trouble figuring out, but eventually they found out it was electrical. Apparently, some junction boxes (I think that is what they called them, it has been over a year) totally burned out and nearly caused a fire. They claimed the RV dealer miswired the harness for the trailer lights and brakes. Mind you, it is little more than a plug and play harness (if my understanding is correct) and even if my understanding is not correct, the RV dealer has been in business for over 50 years, and installing the wiring for trailer brakes/lights/brake controllers is part of their business, I think they probably know what they are doing. However, Kia didn't want to pay the $8000 bill for fixing the electrical system, according to a lawyer friend of mine it was pretty much a coin toss if the judge would believe Kia or the RV dealer and me (and if I relied on Kia to sue the RV dealer even though my gut told me Kia was full of it, the RV dealer had their own experts and again, coin toss), and I didn't have the money to pay both a lawyer and for my repairs if I lost.
So, in my experience, Kia will go out of their way (more than most manufacturers) to blame problems (if they are expensive enough anyway) on anything they can to get out of paying a large warranty claim. Had I had the dealer install my hitch and wiring, if they claimed it was the install, then the dealer telling me it was the install would have been liable anyway (they'd have to pay it through Kia's warranty, or themselves for their own negligence).
After being burned, I'm not sure I'll ever buy a car/SUV/truck to tow unless it has the tow equipment already installed, or barring that, that I can have it installed by the dealer I purchase from. Even just for a tow rack, and never installing the harness, I don't trust them to try to pull something, and if they can give a reasonable sounding explanation for how your install messed up whatever went wrong it can be hard to win (in my case, the dealer got lucky/I got very unlucky I guess that it was electrical and the trailer wiring was related electrical work). I definitely will never trust Kia to do the right thing if the issue with the car can be made to sound like it could be related to any aftermarket work, and even if I decide to trust other manufacturers (millions of hitches are out there, many are not factor or from the car dealer, most people don't have issues), I'll never trust Kia in that case*.
*Note: not only do I not trust them in the case of anything aftermarket on the car, it has soured me on Kia customer service. I trust the cars, I just bought a Hyundai Sonata (mechanically the same car as the Kia Optima), but with my CS experience, I will NEVER buy a Kia and add anything to it other than at the dealer, but I might just never buy another Kia.
*Note 2: I wanted to take my car to another dealer for a 2nd opinion re. if the repair would be covered by the warranty (Kia didn't send someone to the dealer to determine that it wasn't covered by the warranty, they relied on the opinion of the dealer). However, since it wasn't going to be a covered repair, the dealer insisted I pay around $2K just to get my car back to cover all the time they spent diagnosing the issue and the time it would take to put everything back on the car they had taken off. I didn't have $10k lying around to get the car out in case the other dealer also said it wasn't covered by warranty. This situation also has caused me to refuse to do business with the dealership group as well (no Kia, Toyota or Chevy from them in my future, though they call me and email me every month or two trying to get me to buy something from them, and I tell them each time why I won't).
Sorry for the long rant...
TL/DR:
If you buy a Kia, and you want a hitch, I strongly recommend having the dealer do it or it may be very costly in the end.