Start with the Arizona Department of Real Estate website and verify credentials, search licensees by entering their names. 

For example, Intel headquarters, Amazon, FB, Google, Honda, Anduril, etc!

You want an accountant that can help you strategize and who is responsive when you want to know the tax consequences of the decisions you are making throughout the year.Good luck in your search.

My wife and I on the search for our 5th property and looking to go for a 6-12 unit multi-family.

I just did a quick search of the area and there appears to be an ample supply of properties with an average rent of approximately $1.10/SF.

Search the forums for complaints about Anderson Advisors. 

You can also use the search feature (magnifying glass in upper-right) to look at previous conversations.

I invite you to search this forum about ADU appraisals.  

That's a red flag for me.d) death by Google: I Google everything I can about the sponsor.

That's a good idea and now I'll have a buy box for searching.