Presets are good to be in the same folder and grooves are fine to be in sub folders of a mother folder (mine is called grooves)
I always keep User presets in C:\Users\ME\Documents\BFD Drums\BFD3\Presets and other factory presets in C:\ProgramData\BFD Drums\BFD3\System\Presets
Audio/data should never be in the same folder though.
I have all my audio (expansion kits) in a master folder called FXpansion (soon to be renamed) and then each expansion kit with have it’s own named folder like BFD London Sessions and so on.
Steve