Use secret vaulting, never a shared password manager.

For ultimate offline secrets like HSM, CA, or crypto private keys, buy new printers, print the secrets as QR codes and keep them in safety deposit boxes at 2-3 different banks.

For passwords you don't want any one exec to have, use N-person keying by splitting 1 or multiple keys into pieces such that a quorum of 2,3, etc. are needed to utilize the secret.