Mk4 Jetta wagon (2001 to 2005) will hold Williams system 11 and WPC games (not sure about widebody games).

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You do not have to take the back box off, but the trim panel that runs long the top edge needs to be removed (pulls right off) and then Sys11 and WPC will just barely fit height wise. However, my measurements of Stern pins seem to imply that with the backbox folded down, it will be too tall by a couple of inches to fit into the opening.

The B5 Passat wagon (2001 to 2005) range would be a bit bigger so maybe Sterns would fit... ???

We have a 2019 Golf Alltrack, and I'm pretty sure the backbox will have to be removed to fit.

Yes, same body was used on the Passat wagons up until 2005, then 2006 is when the next gen of Passats came out.

If the mounting points for "latch" (baby seats) are on the seat backs, some were flush and some are raised... the raised ones will need to be removed, they are held in with a single bolt, 13mm as I recall... then you'll have a flat surface to slide the pin over.