I too have a 2017 Alltrack (see my sig line) and put the spare from that in my eGolf, after putting a full size spare in the Alltrack.
For safety reasons you should buy the part from VW that secures the spare tire to the floor, to prevent it from flying around should your car end up overturned. It's under $20: https://parts.vw.com/p/Volkswagen_2015_e-Golf-SEL-Premium-Hatchback--L---cylinder-ELECTRIC-AT/Mount-bolt-Spare-Tire-Bolt/62807544/5G0803899.html The area under the felt is the structural steel of the car, and VW helpfully provided a slit in the felt for this bolt to slide through.
As you found, the plastic part that covers the rear bulkhead doesn't quite fit with the spare tire, but you can either dremel out the excess plastic, or buy a new part for a Golf that has a spare tire and will have that part cut away, or simply let heat eventually distort the plastic to mold around the spare tire.
JoulesThief said:
My spare tire is an AAA card with 100 miles of free towing. To a tire shop for a patch or new tire. Could be time consuming, though.
True... though I haven't had a flat tire in probably close to 20 years, and haven't had to use AAA very much at all. Not really current on how good their current service is.
FYI AAA has been quoting extended ETA's lately, particularly when it's raining, due to all the accidents plus cars not working due to a rain-related electrical malfunction.