Looking to organize my portfolio

[Michael Grant]

I own 12 rentals at this time and always looking to add. I am looking for the best way to collect rent and keep everything organized. Thought about mailing, but then the tenants say they mail it and I don't receive it till the 10th. Driving to collect gets aggravating because i feel i am on their schedule. Any ideas would be appreciated. also looking for an app to organize receipts for repairs and fuel. thanks in advance.