I emailed etrailer about a hitch and this was their reply:
"Thank you for asking the following question:
I am wondering if the trailer hitch for the 2020 Kia Sorento is compatible with the 2021 Sorento
if so or not which one is?
Answer:
The 2021 model year Kia Sorento is the first model year of a new generation vehicle, the hitch for the 2020 model won't fit the 2021, as there were enough changes in the rear structure of the vehicle to prevent fit.
The hitch manufacturers do have hitch fits in development for the 2021 Kia Sorento, but they're not quite ready yet. The COVID situation and the hitch manufacturers difficulty in getting test models for the car dealerships to preform test fits on have dramatically slowed down the development. For a 2021 model, they would typically released fits last summer but all that's been pushed back."
I guess we'll be waiting a little bit longer unless we go OEM