You can basically reach any rank with stable 60 fps.
I played the first ~2 years on 60hz too and switched to 165hz about a year ago. Personally, you can def feel the difference in performance pretty well, also i increased in skill a lot through that (from my point of view at least :Hehe: ).
Since almost half a year im playing on 240hz which is alright, but the difference is not as big compared to 60-165.
The game is def well playable on 60 frames the second, but i“d recommend trying out 144 or 165hz!