Virtual Address - Advice

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Hi Gang, I'm running a site in Australia, that's scaling quickly. For a more professional persona I would like to more away from using my personal address / phone number. Plus I get inundated with marketing calls!
I've organised a virtual number and that's working perfectly.
How about a virtual address? Any recommendations?
The main purpose is directory listings. Will a PO Box suffice?
I don't really have a requirement for traditional mail, the purpose is more for directory listings.