I posted some info about a hitch and wiring harness for a 2020 but the post contained links so it’s waiting on moderator approval. Not sure it will help with the 2021 cause I’ve read that Hyundai redesigned the chassis so the bolt patterns may not line up anymore. I bought a Curt class 3 hitch, model 13195, and a Curt wiring harness, model 56420, and they fit my 2020 Santa Fe perfectly. I got them from eBay and the hitch was only listed as fitting a Kia Sorento but it works on the Hyundai also. Then the instructions it came with said 2019 Santa Fe with no mention of the 2020, but it did say 2020 Sorento. Can’t account for all that confusion. All I know is they bolted up and plugged up perfectly with no modifications at all.