There are some models of cars that allow you to use one bar from each
latch and use the
latch in the center. Withour having your manual, it is hard to say. It is however perfectly fine to install the seat in the center position using the seatbelt. The seat can be secured just as well and just as safe using the seatbelt. So to be on the safe side I would put it in the center using the seatbelt instead of the
latch. You may also be able to call Volkswagon customer service and ask them.
Good Luck!