Well you know last update it needed to be all in one folder. I had trouble with it showing up in game then too and had to redo it so all the folders were in one. Should I do a search and find that post? I am not a total freaking idiot like this makes me feel sometimes.
Mac install of addons is the same as PC (each addon folder into WoW AddOns folder). It has been that way for many years and probably Blizzard always did it like that.
Carbonite consists of 4 separate addons. Each of those addon folders goes into the AddOns folder.