If it's a larger organization, feel free to inquire about their different staff qualifications.2.

My qualifications are on the higher end , but I get better tenants 

You get the idea.Leave off your qualifications in the ad. 

If I could summarize what is most important (unsolicited advice here): (1) Do not put the rental on the market until it is 100% ready for move in (2)  Provide a list of written and minimum qualifications the applicant must meet  (3) require the tenant obtain renters insurance (4) execute a strong lease (5) have a list of trusted and licensed vendors (6)  get good landlord insurance and possibly umbrella insurance if needed (7)  be quick to take care of work orders (8) let the lease dictate your actions/responses......

However, you can also build a SFH that meets DADU qualifications as a SFH, and convert it to a DADU later.I'd love to hear a little bit more about your goals, and what you're trying to accomplish - I think I could give better advice after knowing where you're trying to go with this.

Does the Streamline FHA Refinance have different qualifications?

If you don't meet the accredited investor qualifications, you should be able to find some syndicators who accept sophisticated investors. 

So it’s not necessarily in the property manager’s best interest to locate the best quality tenant, but an okay tenant that might be close, but doesn’t quite meet the qualifications.

I am using 3 houses that sold in the area that meet all the qualifications above, add them, and divide by 3. 

With the correct team, right systems in place, proof in the pudding, and data to bag it up…… the company that have these qualifications would be more likely to ease your pain.