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The seed phrase on the Trezor device is safe from all of those things. The seed phrase/private keys never leave the device, so there is nothing on the computer to protect against.
Also, a fake firmware cannot be installed, because it won’t be signed and will be rejected.
However, you do need to watch out for clipboard viruses on your computer, which will change the copy/paste address when you think you are copying your own address and it changes it to the hackers. You should always double check the address that shows on the Trezor and make sure it is the correct address.
And, as always, never enter your seed phrase into the computer no matter what.