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I can't give an answer to OP's main question because I don't have multiple Trezor devices. I built myself a PiTrezor in the past and I guess I could simulate two or more Trezor One hardware wallets by using multiple microSD cards for the PiTrezor if I had the time and motivation to do it. (Likely won't happen any soon, sorry.)
But I'm not using my PiTrezor for more than Testnet coin wallets at best.
Do you know of a good guide for doing that? Is PiTrezor a common term for it, or is that just what you call it?
It's a great idea. I've been meaning to build one for a while. It's on my long list of "I'll get around to it, eventually" projects.