It would be much better if FSR had a dynamic resolution based on frame rate target slider instead of presets.
The slide could go from 0 (FSR disabled) to Refresh Rate value as Max target.
Example: if someone's monitor is set to 120Hz, the FSR slider in-game would have a range of 0-120.
This is much better than presets since it will allow you to get the exact frame rate that you want rather than fiddling with the presets.