I'm also planning on installing a hitch mounted bike rack. I like the look of the European towbars, however, they don't fit directly to the US style hitch mounted bike racks which I prefer. I'd post a link, but I'm a newbie on this forum with link restrictions. Search for "Kia Niro towbar". Rameder has a good selection.
There is another clever alternative that I've seen on some models of Subaru, Scion, and Hyundai which is to use the threaded towhook attachments. These cars have a pair, left and right. Just search for "subaru custom bike racks". I can confirm there is one threaded attachment on the left side of the Niro. I'll take the rear bumper off soon to confirm if there is a second threaded attachment hiding on the right.