Don't let your seed anywhere near an internet connected device.

You should have something airgapped like a cold card as a minimum.

I used galvanized washers for my seed. You can connect them together with a bolt. This is fire and future proof. Make sure your nut, bolt, and washers are made of the same material to minimize electrolysis.

The washer set up cost me about $12 and is far more fire resistant than the plates you can get online.

The passphrase is what really matters.

If you have a significant amount. Multisig is the only way to go that makes sense.

2/3 cold wallets must be there to send funds.

All 3 wallets should have a passphrase, and be stored in different locations.

Stamp all 3 seed phrases onto different washer set ups.

Stamp the pass phrasesi on one washer and keep that hidden.

Keep a small amount of bitcoin in each seed phrase wallet, and seed phrase+pass phrase wallet to satisfy thief's in case of theft or 5$ wrench attack, this will keep your primary stack safe.

Never talk about your stack.

Opsec will keep you safe.