Why would you need multiple trezors?
The seed is the key, the trezor is like a blank that can be loaded with any key, wiped then loaded with a different key.
In fact having loaded trezors around is riskier than having an empty one with seeds stored elsewhere, off-site, divided up etc.
it gets even more complicated than this.
turns out, you can have multiple wallets loaded into the Trezor all based off of one seed. to do this, you click "Enable Passphrases" in advanced settings. each time it asks you for the passphrase, enter in a different one, and you will generate multiple wallets. a different passphrase acts like an additional 25th word of the original 24 word seed thus creating a new wallet. you could deposit all your cold storage savings in one wallet then deposit 1-2 BTC in another. then if someone rubber hoses you simply reveal the passphrase to the 1-2 BTC wallet for plausible deniability. it's a clever little device.
now that you've posted this your denial is implausible, so I will use monkey wrench attack until I get at least 5 passwords from you (or you die).
(sorry to put it that drastically. this is not really my plan, of course, just making a point)If you want your money safe against such attack, you better have a component involved that you really "don't know" and that isn't "on you", like a seed in a safe somewhere. Shamirs secret sharing sounds like a good idea.
In the end, an attacker can always abduct a loved one and extort coins from you, no matter which way you have secured them.
There's nothing better for safety than a world in which everyone participates sufficiently in prosperity.
