In case it helps anyone, I am running e on a Polaris (Xiaomi Mi Mix 2s) after trying for weeks.
ROM is the unofficial build from Oct 19 above
Steps:
- clean installed Miui 11 (Pie based)
- restart to system
- restart to fastboot
- install TWRP via fastboot
- boot to twrp
- Wipe -> format data
- reboot to recovery
- wipe -> system + cache
- install ROM via adb sideload
- reboot to recovery
- reboot to system