Despite Trezor being trustworthy, I don't want to rely solely on it. I have purchased a Keystone 3 Pro, and will store ETH along with my Trezor Safe 3.
That's completely normal, I understand that. It makes sense to spread out your coins and store them in batches using different hardware wallet brands. Too bad that you didn't wait a few more days to purchase your Keystone. Black Friday is coming up. Keystone's website is already advertising Black Friday deals starting from tomorrow. You could have saved some money.
Thanks for your help. It cost around $137 and it just arrived today.
Now I have three hardware wallets, Trezor safe 3, Keystone 3 Pro, and Bitbox 02. I use Trezor safe 3 and Keystone 3 Pro with the Metamask software to store altcoins, and I use Trezor safe 3 and Bitbox 02 with the Electrum software on a offline computer to operate BTC (this is already secure enough, so there's no need to use Electrum's multi-signature function).