I have an Apple TV 4K (I think the first 4K generation if that matters) and a Philips OLED TV. The TV has a 120Hz panel, but for HFR 60Hz should be enough (?).
However I’m wondering if Infuse or the Apple TV in general can play HFR content (with 60fps). Unfortunately my TV can’t show the current Hz (only during gaming).
All current Apple TVs will max out at 60Hz so it’s not possible to get 120Hz.
Also, performance may not be amazing on older devices (like Apple TV HD) but the Apple TV 4K models should be fine with anything encoded in h.264 or h.265.