You should be aware more than one insurance carrier will not underwrite a home with active knob and tube wire." 

This can expand and compress quite a bit based on the carrier, so you'll want to find a carrier comfortable in the MF space.

Please use an independent insurance brokerage who can access many different carriers.

I can tell you that what is the best Insurance Carrier price wise varies from property to Property.  

I generally prefer to work with brokers who work with multiple carriers rather than those who are tied to one main company.

Yes please use a independent insurance brokerage with access to multiple carriers.

This is why a lot of investors will recruit postal carriers, UPS drivers, Uber drivers, and the like to help them prospect for deals. 

A PA will also know statutory deadlines and the insurance laws carriers must follow in order to hold their feet to the fire.But on that note, do your due diligence, because just like when hiring any other professional, there are a bunch of really crappy ones out there.

There are several very competitive Insurance Carriers for the Multi Families but which is best varies from property to property.  

At very least, you should provide a link to your LinkedIn profile here on your BiggerPockets page, along with a phone number, email address, favorite carrier pigeon name, and any other reliable method to reach you.You never know just when money will come knocking, but it rarely knocks twice...