That’s great your PM and Neo are so close, so that solves at least one issue - I would just use the same FTP number for your zones both on the turbo and outdoors.
Regards which test to use and the TTE point:
- Kolie Moore's FTP test protocol
- 20 minute test, or maybe Critical Power 30, as your target events are this length. Lots of discussion on here about the test protocols, have a search and see what takes your interest.
The first link also answers the TTE point as well.