My ideal would probably be something similar to what Linus has set up. He uses long cables from a nearby closet, so even when the workstation fans are blasting he doesn't hear it. For now, I use 2 and 3 meter cables plugged into a mid tower sitting on the far side of my desk on the floor.

For why I'm not doing the workstation-in-another-room approach: The 4K@120fps HDR OLED relies on HDMI 2.0 cables, which are only recently available at 3 meter lengths. Linus is using a not-commercially-available prototype optical HDMI repeater to get longer cabling.

For normal use the system is near-silent and at full blast it's below the noise floor with a headset playing something at a reasonably low volume (and not distractingly loud even if I just have the headset on with nothing playing).