They will all hang far lower than any decent hitch should, it’s a horrible, lazy design by Kia. But to answer your question, they’re all basically the same thing.
Exactly. I planned to install a hitch on my Sx but I had to realise , it's just not designed for a hitch. Hicth can be forced on it but looks really ugly , out of place.Uhaul also has a hitch and harness . It’s cheaper than the ones you listed. Install is pretty easy. And as stated previously, none are integrated into the design of the vehicle. They hang down and appear as an afterthought.