I thought I would share with you how I added a mic for my aftermarket head unit in my '16 Edge.
I went with a 9" Pioneer and Maestro RR kit. I didn't want the mic to be out of place, but I also wanted to retain the best audio I could. I figured if the factory location works for the Sync audio, it should be good for the Pioneer as well. I didn't know for sure if the OEM mic gets used at all, and I suppose I still don't with 100% certainty, so I did want to leave it in place. Fortunately, there's an open spot to the right of the factory mic in the overhead console. I measured for and modeled a housing for the mic capsule from the pioneer mic assembly. I 3D printed a new housing for the mic that snaps into place in the overhead console. I goofed on a couple of dimensions, so the cover is glued on instead of using the screw holes. But I figured it is good enough for a prototype and if I ever need to take it all down, I can redo it then. But this works great.
(Sorry for a couple of the pics being out of focus. I think you'll get the idea, though.)