This is a great place to meet active RE investors and other industry professionals. 

-----But if you have your own addendum referenced above, here are few others you could add to the list you made:Annual Maintenance Encourage tenants to perform or arrange for annual maintenance checks on their AC units to ensure optimal performance and safety throughout the season.Contact Information for Approved VendorsProvide a list of approved vendors or technicians whom tenants can contact for professional installation, maintenance, or repair of their AC units.Emergency ProceduresInclude information on what tenants should do in case of an AC unit malfunction that may threaten the safety or structural integrity of the property, such as water leaks or electrical issues.

You charge them for the stand, and professional installation, and they leave the mounts when they move out or pay for your removal.

You may want to start off with a turnkey company to learn the ropes.

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

I'm seeing the same, and my recruiter friends are telling me the jobs that they are trying to fill companies are just interviewing and keeping a pipeline and not actually making an offer when they find the right person.

They did remove it, but I have changed property management companies, and now, 2 years later, I see that the trampoline is installed again, and the tenants have installed a second shed without my permission.

What kinda of company does this?  

Another way to find a property management company that knows those zip codes is to search rentals in those zip codes on Zillow or HAR and see who has many listings and see how they are presenting the property to the public with their pics and description of the properties.

Have you tried one those 'home restoration companies' ?