You can add Kodi to an Amazon FTV. I use it for streaming my personal ripped DVDs. Old Uk TV shows can be a bit jerky via the AFTV, and I tend to use Kodi Via PC for those. US shows are fine via FTV.
You'd be better looking at a forum such as this for the best advice:
https://www.avforums.com/forums/netw...streamers.332/