I inquired about the possibility of a two-company structure: A traditional LLC that is the public face of the activities (collecting rents, paying contractors, etc.) and managing the Series LLC with each property in once cell in it (in this case, Series LLC is serving as a holding role).Again, one attorney said that would be much better than a standalone LLC and that is recommended approach, and the other said it is waste of time and money since there are some requirements from Texas Real Estate Commission, which is requiring being a licensed broker in the state to operate in the managing LLC.So, just want to hear what other Texas investors are doing when it comes to series LLCs regarding these issues. 

Why not just buy the property with a traditional DSCR loan and avoid the complication?

It is not a traditional currency we can understand.

So you may buy one property with traditional financing, one all cash for a BRRR, and one with seller financing with a lower down payment (for example).

You mention a traditional STR PM agreement where the upside is shared by both parties.

.), are there any particular upsides or downsides of purchasing all single bedroom units vs. a more traditional mix of units for a property that size? 

(The tradition here is one month's rent for the fee.)6) How does trash normally work?

@Matthew HullIt’s the same as traditional closing.

So the money flows from my traditional IRA holder (like Vanguard or Fidelity), to DirectedIRA (my SDIRA custodian), to now Axos bank which is in the name of my LLC. 

My first location I would go with a mix.  30 wide traditional drive up, parking and cargo containers.