Don't just do the bare minimum VRR support to be HDMI 2.1 compliant though. The spec only requires a very narrow VRR window. Lots of cheaper devices make this window 48 to 60 hz, even when the display itself supports fixed refresh rates up to 120 hz. VRR should work anywhere from 30 all the way up to the maximum refresh rate supported by the TV. That is why I mentioned the G-Sync/Freesync Premium certifications.
Don't just do the bare minimum VRR support to be HDMI 2.1 compliant though. The spec only requires a very narrow VRR window. Lots of cheaper devices make this window 48 to 60 hz, even when the display itself supports fixed refresh rates up to 120 hz. VRR should work anywhere from 30 all the way up to the maximum refresh rate supported by the TV. That is why I mentioned the G-Sync/Freesync Premium certifications.