I’ve reviewed a number of theses DST’s across numerous asset classes  and there performance /returns are generally fairly low and unimpressive. 

I will provide more information later.The two main setups are:1- Holding company in Wyoming if I want Charging Order Protections advantages, then a Series LLC in Kansas holding my Kansas RE and another Series LLC in Missouri holding my RE in Missouri.2- Holding company in Wyoming if I want Charging Order Protections advantages, then form as many LLCs as I want inside of it, one per rental or one LLC per 2 o 3 rentals.Fees are pretty reasonable and the same as they disclosed before the appointment, on their website or youtube videos.

As far as a flat rate, I would talk to companies offering services as mine and ask. 

We have a property management company and real estate brokerage. 

I’ve got numerous other examples.  

Keep in mind if you are renting a house to a company you can write whatever you want into the lease. 

Similarly, quality dividend-paying companies often retain some earnings to reinvest in their business, increasing the company's (and your) value over time.

There are companies also that just tunnel. 

Quote from @Marlena Hawkins: Does anyone know what insurance (liability, E&O etc.) is required for Property Management companies in DC and Maryland? 

Built a 20 person company around our own portfolio.