Hi,
I'm in this group and I'm going first, no conditions: WinBall goes on a real device within a day and stays installed and opted in for the full 14 days.
Mine, whenever you get to it:
1. Group:
https://groups.google.com/g/eaisto-testers (open, admits you on the click)
2. Opt-in:
https://play.google.com/apps/testing/tat.mukhutdinov.eaisto - press "Become a tester"
3. Install from the link that page gives you
It's a field tool for vehicle-inspection stations (English build is in review; interface is Russian until it lands). Nothing to work out - no reviews, no screenshots, no daily opens needed. Google counts testers who stay opted in, so all it takes is leaving it installed.
Bulat