What features are they wanting?  

On the other hand, they will manage investor's unit as part of an 'apartment complex' (https://www.zillow.com/b/6734-summer-fest-drive-109-110-san-...).

Essentially that's what you described doing, but with the added complexity of the auction process.

This can range from a few thousand to several hundred thousand dollars, depending on the complexity and size of the project

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

., as well as most countries require the settlor to give up control and benefit of the asset in question for the “asset protection” aspect to be legally effective, some countries (usually very small countries) have laws for trusts that theoretically allow some control (or at least input) of the assets by the settlor while still maintaining the asset protection feature.  

The rules are complex, and unequivocal.

Commercial properties tend to yield higher returns but come with more complexity, higher risk, and longer vacancy periods, making them better suited for experienced investors.

I guess this also depends on how many rentals you have and what features you require in a PMS.

Keep in mind a few things - many major markets currently have a glut of multifamily projects so you may be competing with large apartment complexes with amenities offering incentives in a competitive market.