I got my APIM and screen from Simply Michigan on eBay. It needs to be the recessed screen and they go quick. I missed 2 or 3 before I finally snagged one. Not cheap, but better than spending similar amounts on a replacement head unit. I mainly wanted AA capability, but getting updated built-in maps and the more responsive and better (IMO) interface was a big plus. They were out of stock on the USB hub I needed for my '16, but had the hubs for the '11-'15 models. I got the hub and antenna from Amazon.
Simply Michigan eBay Store
USB Hub for 2016 on Amazon
Antenna on Amazon
Those are the parts and pieces I bought. A little over $800 total. I emailed SimplyMichigan about the recessed screen and he gave me a heads up when they were about to add another unit to the store. Very responsive eBay seller. Like I said, they go quick.
None at all. I used
FordSyncDownloader from Cyanlabs. Very straightforward and the apps author is very responsive on Discord (there's a link to that in the app).
Pic of 3.0.18093 running on my 2016 Sport.
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Pic of AA running on 3.0
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Pic of iHeartRadio running through the Apps function in 3.0.
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I didn't take any pics after I updated to 3.4.20136, but other than visuals and responsiveness, it pretty much works the same.