Thinking about using a P.O. Box

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Well I have 3 rental properties and always pick up the rent in person every month. I was thinking of getting a P.O Box and having them mail it there instead of my home address. I never gave any of my tenants my home address but its not hard if the want to find it. All they need to do is go to the county website. Just wanted to see how you guys do it. I plan on keeping my rental for a very long time and don't want a crazy tenant who put in a little bit of effort to be banging on my door one day, which brings me to my next questions. Would I need to have my properties in a LLC to change over the deed address from my home to my P.O. Box and all the mail I get from the borough as well, Water, Sewer, Trash since they are all my home address as well. I would really like to keep all my rental separate from my home address but not exactly sure where to start.

Thanks for the advice in advance.

Nate