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Actually the module fits into a TPM connector on the board (if it has one) - see maketecheasier.com/install-trusted-platform-module/

tpm.jpg

You definitely know your stuff. I know who I'm tavging the next time I build a PC.
I just checked and my board has that. Windows 11 works fine though. Do you think it's worth buying?

You shouldn't need it. If you managed to install Win 11 then you already have the chip built into the board. I'm guessing the fact you have that connector is so you could upgrade the fixed TPM chip to say a TPM 3.0 chip should they be released at a future date.