While I'm concerned about having 10 or 20 bank accounts (one for Parent LLC and one for each series), what is a good practical operating and asset protection way to set up this series LLC? 

See NC BAR summaries on practicing law and NCGS 84-2.1 - "Practice law" defined for statutory details.  

if in my practicing , I find what could be great for someone: is there a place on bigger pockets to simply share it ??

I was watching one of the old webinar's recently and @Brandon Turner mentioned opening a new bank account for a property he had just closed on, and it made me wonder if it was a practice that folks were doing for each property.

I am in Silver Spring MD and currently in practice with another physician and we are leasing an office.

Welcome @Erik Strauch, we are practically neighbors.

I am using one to purchase a 6 unit here in Cicero, IL right now, so I am practicing what I preach!

Disclaimer: While I’m an attorney licensed to practice in PA, I’m not your attorney.

ACH withdraws are a common practice to help secure payment and take the head ache of remembering to pay it your self.

Not sure if my question is visible, but the numbers are super rough because I am practicing the analysis.