While there are some deals 50 units or larger that transact without a broker involved, they're definitely few and far between.

Depending on the ARV, I think you are better of using your own cash or getting a partner involved to finish the rehab and then cash out refinance with a conventional or DSCR loan.

Renewal shouldn't involve the agent.

If looking to scale flips and create systems around it to minimize your time and involvement, I'd highly recommend putting a team in place that can handle the day to day operations. 

Too many people involved to do a relatively simple transaction.

If you don't have VAs or don't have other owners involved, it might be all you need. 

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

It's a tough situation for all parties involved.

Having an expert landlord attorney involved will help you a lot.As for the actual question, it is very difficult if not impossible to "stop" a tenant from damaging your property, because you are not inside the property to know what they are doing.

Managing a company usually does not involve participating in real estate acquisition, management or construction.