HELP! Kansas Series LLC _Spreadsheets_Book keeping_Accounting_Tax

Am I really supposed to buy 16 versions of fresh books or quicken to get some system for taking care of my rentals? I feel like I'm reinventing the wheel with spreadsheets and having to have 16 files for each different llc and bank account. It is just starting to add up. I have 8 SFR's, laundromat, commercial, close on a 4 Plex this week, and looking at a few more places in the coming weeks. I need something better. Does anyone have a spreadsheet system they would share? Is there a program that will help manage like cozy but allow all the different bank accounts, EINs, Business names. The last thing I want is horrific accounting and tax issues because this process isn't working but then even cozy requires multiple steps of log-ins and passwords if I do the process through them. PLEASE HELP!