I'd look into Bitkey. It's multi-sig by default. Your phone, the bitkey device and block server acts each as a key. You need 2 of 3 sign and you have access to a mobile app to check on your stack. In that case you just follow their setup, its multi-sig by default.

Bitkey

Bitcoin Self-Custody Wallet, App & Hardware

Bitkey is a bitcoin self-custody wallet with an app, hardware device, and built-in recovery, so you keep your private keys without losing access.

Great instruction videos come from Ben on BTC Sessions. But before you decide your route remember these options: - Multisig is best with wallets from 3 different manufacturers. Do Bitcoin only wallets or install the Bitcoin only firmware for the ones you get. Do Trezor, BitBox02, Blockstream Jade, and Passport Core by Foundation Devices. - Single Sig + Passphrase is more robust than singlesig, but less complicated and less expensive than multisig. But you MUST MUST MUST do all the homework to fully understand the Passphrase, what it is, that you need it to access your funds at all, and how it works and how it can trip you up. - A blend of the two would be the Passkey by Block (make sure you use the one with a screen).