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You can add Agency members from different countries. Please add the address of your company in the fields provided. The payment method needs to match the account information of the Agency owners. If the billing method is named after the business (for example, it’s a bank account named after the company name) you may be asked to provide documentation to verify the information. You can refer to this Help article for more information
When setting up an Agency profile you can use the primary location of the Agency. If all Agency members are located in different countries it might be a good idea to use the location of the Agency Owner. That said, please keep in mind each Agency member will need to use their real physical location as their address in their profiles.