I also have a 2016 with power folding mirrors and the dealer I talked to says they don't have a fix for making them autofold like the new MKC. I thought there would be a module from the MKC I could plug in, but they said no.I also thought it was dumb on Lincoln's part to excude this feature. I've forgot to fold out the mirrors a couple of times after driving off at night. It seems dangerous to have to unfold your mirrors while you need them at that moment. My other car'so mirrors autofold and they work fine. I can't see why you would not want them folded when you lock the doors.
I also bought an autofolding module on-line hoping to retrofit it, but when I opened up the door panel, there where too many logic wires and remote wiring to hook it up. If I had a wiring schematic, I might be able to do something.