I thought you were referring to this: 16" Macbook Pro gets excessively hot when using external display which I’d been reading only a few moments before.
If fan noise is a really big issue for the OP then it’s definitely worth pointing out that a notebook will always have more of that than a desktop. That being said, unless I’m doing something moderately computationally intensive, I don’t hear my fans, they certainly don’t spin up in any way that I can detect just by virtue of having the computer on, lid open, and external displays connected. That being said, that being said, fan noise sensitivity is a really individual thing and your point is well taken.
That’s a very good point and the OP would have to make sure that that would be an option. Obviously the way to proceed here is to buy Apple’s Pro XDR display at the same time and return both if necessary 