Well, that was easy -- just as described in previous post.
I didn't get the Kia ones because they cost is 4x of the ebay ones. Plus the ebay ones are more streamlined, doing the same job but blend in with the car's overall lines.
The only negative is that the width of the end of back door vent doesn't match the end end of the front door one -- it is wider & sticks out a bit more. Nothing major, just would be nice if they matched exactly.
2019 Snow White Niro PHEV EX Premium w SR
Other car: 2015 Subaru Outback 2.5i Ltd