For other hardware wallets I think that UPS mailboxes are better option than PO boxes in US, or simply use any alternative delivery address.
Ledger's support told me that they only work with DHL in the United States, and according to them, DHL doesn't deliver packages to PO Boxes. Their suggestion is using regular mail if you are a US customer.
So therefore it would be useful to also add
official (overseas, with respect to manufacturer location) resellers to the list.
For example, US-based
Foundation Devices sells in EU through
https://shop.btcdirect.eu/, so it would be helpful to know whether they sell through PO boxes (though they apparently don't yet sell batch 2) for EU-based customers.
Adding one or two more columns with reseller information is certainly doable. Contacting each individual reseller to ask them about PO boxes is quite the task though. I know that Ledger and Trezor have dozens of them worldwide. Since you mentioned Foundation Passport, I know they have
3 official resellers in the EU. The one you mentioned is for the UK, but there is also Cryptomaan and Bitcoin Brabant for Belgium and The Netherlands.