However if you need one you can start interviewing property management companies as well.  

As part of selling interview numerous agents. 

If there is not an instant "yes", move on.2)  If they answer "yes" that they are investment specialists ask a few pointed questions like house hacks, cash on cash return, cap rate, DSCR, 1031, ARV, make it like a job interview to make sure they aren't just blowing smoke to get you to sign their buyer representation agreement. 

Hi Ivan,This is the list of questions we used when we interviewed several attorney. 

One thing I wish I did before purchasing in Baltimore was interviewing  at least 4 property managers.

You also have general Real Estate or Multifamily podcasts like Bigger Pockets, Pillars of Wealth Creation, Target Market Insights, etc that interview a ton of syndication companies. 

Their market value was $5000-$10000 more than local realtors we interviewed would list the house for.

As a matter of fact, you may be able to get some good answers for your area just by interviewing a few prominent mgmnt companies in the area.That aside, maybe try talking to the tenant and meeting them at the "human" level.

It wouldn't be worth it to do a couple properties so I need to decide if I want to build the management company or what to ask and look for when interviewing other management companies? 

I'm interviewing PMs and getting different quotes for fees.