I can't confirm for the Mk7 but definitely Mk5, Mk6, Tiguan and Beetle only have ISOFIX points on the two outside seats in the back.

If you're looking at ISOFIX seats I'd recommend the solid latch type that is commonly used in Europe, not the 'connector on a belt' type I've seen here. Having a seatbelt setup with ISOFIX latches seems a half-baked implementation - if you're looking at the safety of ISOFIX then having the seat physically linked to the chassis is the way to go.

If considering an overseas seat do your own research above and beyond what's on the Aust Govt site linked above - it implies that European ISOFIX seats are unsafe compared to the new Australian standard but I'd read the EU regs for yourself before making that assumption.