Interesting changes to the DC finals for this year...they are now going to be co hosted with Madrid by Innsbruck and Turin. 

GB (who are playing France and Czech Republic) are now moving to play their group in Innsbruck!

https://www.bbc.co.uk/sport/tennis/56719028

It looks like Innsbruck and Turin offered similar playing conditions (altitude? And on hardcourt of course?)

GB will stay in Innsbruck for our QF if we make it that far 

Presumably Turin will move quickly from the Tour Finals a couple of weeks previously and into hosting this. 

It wont be long before somebody suggests the best option is to have 16 teams in a knockout event, and play with one team being allowed home advantage. Which would clearly be a ridiculous idea and would never work...hang on