Dont think VW will be offering a hitch for the R.
Reading in my manual, it says it strongly recommends against towing if the car is DSG fitted.
Recon on the R it will be tough to fit a Tow hitch because of the haldex/Exhaust and in your case the DSG & DCC.
What about the bike carriers that clip on to the rear window? Like this: https://www.etrailer.com/Merchant2/graphics/00000001/pics/q/u/qu42398_800.jpg
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Problem with the rear window mount bike carriers is that the spoiler is mounted with adhesive tape and the straps will put too much force on the spoiler and dismount it eventually.
I saw some where that a hitch was modified from the GTI model to fit the R.
It is not a total DIY job because welding and cutting is needed to fit the exhaust but it is doable if you have the skill and equipment.I'm thinking of going that way because I can weld and burn.Might just buy the GTI hitch and rent a mig welder for the day.Should take me 1 day to fit 1 day to paint and mount.I don't want my bike inside my car and roof racks suck IMO, been there done that many times.