Bip39-Standalone. Get the expected quantity of COLDCARDs, choose Import Existing during set up and cargo the exact same backup file on to each of them. Give each COLDCARD its individual passphrase then lock down the seed. Your seed words won't be acknowledged to any from the units and remain safe. https://pukkabookmarks.com/story19237402/bip39-passphrase-https-linktr-ee-bip39-bip39-wallet-fundamentals-explained