Your business address must be the street address of a physical location, so the answer is yes, your mailing address can be used as your principal place of business (legal address).
Regardless of which state you decide to form your LLC in, you’ll want to get a commercial business address. A PO box isn’t an acceptable physical address, and using your home address can compromise your privacy.
With a virtual mailbox, you’ll get a US-based business address to list as your principal place of business, send and receive mail, and use for customer communications. Your commercial street address will also give your remote business a professional appearance.