Rendering Questions and manual suggestion

I want to make 24 frames per second into 60

for example, numbered frames from 24fps at 60fps are: 1, 1.33, 1.66, 2, 2.5, 3, 3.33, 3.66, 4, 4.5, 5, 5.33, 5.66, 6, 6.5 etc.

Which setting would I use to make this happen? 1m? I'm not sure, because the descriptions aren't too comprehensive (it might do what I described above, but it also might do something in addition to it - like randomize which frames get averaged twice for example. I don't know because there's not much info in the description, especially for 1.5.

Can you please describe how each frame interpolation mode turns 24fps into 60fps? For my interest, and maybe also for addition to the manual for others to see. Everyone would be able to know exactly what they are choosing from (and more quickly come to the desired result).

I think 24fps into 3 common refresh rates, say 50, 60, and 120, as well as 30fps into 50, 60 and 120 would be illuminating. 24 to 50 allows people to infer what would be done converting 24fps to 75. Doing 120 allows people to see what happens when a multiple of a framerate is chosen.

Also, random question... is making 24 into 60 with the 1m frame interpolation mode the same as doing making 24 into 120 with the 2m frame interpolation mode?
The final quality looks similar, but maybe a bit choppier with less artifacts with 2m 120 (both transcodes have artifacts masking disabled, standard SVP shader, and best CPU motion vectors options selected (half pixel 6px small 2, bu two with local refinement, small, strongest, small)

Please let me know, and what you think about the manual idea.

Also, is it common for Nvidia Motion Vectors Grid set to 4 to cause choppiness, but 8 and above work fine? Software/intelGPU I can set all the way down to "6 pixels Small 2", no problem.

Is using Nvidia optical Flow with its setting of 8 better than the customizable CPU options with 6px small 2? Is there another spot to customize Nvidia Optical Flow?