I'd actually love to hear more about the reasons for having multiple NIP-05 verifications. For the most part, I think NIP-05 is sort of a shitcoin. It's fairly meaningless and lives outside the actual protocol so it can only sort of be trusted.
It's not technically possible to list multiple, I mean, I guess you could put multiple values in the one NIP-05 field but most clients would just puke when trying to understand it.