Wait, does that mean that if I get to 1M NP+ COH and just never check the game again for a month, I'll get my trophy and avatar?
It'll never check for rent/tax if I never open it and just give me the rewards?
Yes, you're right!
Once you hit 1m, just never go to the main page again and the following month you'll get the trophy and avatar.
As long as you don't hit that main page which refreshes, no rent, no tax, nothing. ^^