LONG OVERDUE FOLLOWUP:
Factory-applied RTV sealant is obviously computer-guided. Manually-applied sealant is NOWHERE NEAR as neat. Squeezing 3-ounce RTV tube gets incredibly difficult as you progress.
Dorman Products oil pan (264-359) is listed on the Dorman web site as being correct for 2017 Santa Fe Sport 2.4L engine BUT only 22 of the 23 mounting holes actually line up with the Hyundai block. The 23rd hole is about 1/4 inch mis-located. I was already committed -- RTV in place, many of the mounting bolts already tightened when I dicovered this -- so I decided to proceed, trusting that the excess RTV would be adequate to seal that location.
Since thr RTV pretty much goes wherever it wants when being manually applied, some of it actually ends up in the block's threaded holes, preventing me from reaching full torque value when tightening the mounting bolts

. But remembering how difficult it had been to remove the factory-installed oil pan after the bolts had been removed, I felt pretty confident the RTV by itself was certainly capable of holding the pan to the block...
It's been 1300 miles since I replaced the pan, so yesterday I put the car on my lift and removed the belly pan. To my delight there was no sign of leaking oil, even by the mis-located mounting hole!
This turned out to be a relatively easy repair, but I think if I did not have a 2-post lift, but had to do it lying on my back under the car, I would have elected to spend the money and let Hyundai do it...