Kia already has a fantastic warranty and generally above average quality ratings. IMHO, an extended warranty is a strategy that focuses on risk mitigation rather than overall TCO. Over a broad spectrum of sales, companies make money on selling extended warranties but individually it's a piece of mind knowing that you have a fixed prepaid cost for any future repair. Personally, I've never purchased an extended car warranty or prepaid for any maintenance but given this is a new model year and some of the gremlins that have already cropped up (fuel line recall), I can understand the desire for an extended warranty.
If you do move forward with an extended warranty, just be sure to really read and understand the fine print and do research on the company providing the extended warranty. If the company declares bankruptcy a couple years from now, you can be out of a lot of money and with no extended warranty. Or if the company has exclusions like all maintenance has to be done at some specific location, that can also be challenging if you ever decide to move.
Good luck and welcome to the Carny family.