Dura Pro or Dura Pro 2? From what I read the Dura Pro uses Bluetooth 4.2 and Sync 4 uses Bluetooth 5. They should be able to pair, but it might be causing problems if Sync is trying to set up android auto for pairing.
Go into Sync 4 and turn off anything having to do with Android Auto and see...
It's deeper than the Weathertech and made out of hard plastic. I was able to hold pretty much all my "in case shit" stuff in it and the seats fold down just fine. Uses two bolts to connect to the seat frame.
Note: I dont have the 7kw version so I dont know how well it would fit in there...