So, in order to root the Mate 8, follow these chinese tutorials:
Note: you also need non-encrypted boot img from here:
1. Unlock bootloader (4 Euro solution worked for me too.)
2. Flash TWRP using the tool in the Recovery link.
3. In TWRP, flash the unencrypt zip, format the data folder, flash unencrypt zip again for good measure.
4. In TWRP, flash root. The one available is KingUser (I'm going to try with SuperSU now.)
Note: You can also flash google apps and finally sync contacts, calendars, etc. System partition is small, so flash the micro version of open gapps, 64 bit.