There's no wifi chip on either the SeedSigner or the Portal. SeedSigner uses a no-communication Pi Zero, and the Portal's open-source board only includes NFC capabilities.
Inhave both single-sig and multi-sig wallets. With the multi-sig wallets, I want to have a 2/3 multi-vendor hardware signing configuration. I've already got a Tapsigner for one key, I want a different wallet/signer for the 2nd key, and the 3rd key will be encrypted and stored offline.