Not sure why this needs to be mentioned as you always have to add a folder for the game you want to use in Minion? Without adding the game's folder (the game) it won't be able to download and extractthe addons, or find installed ones.
In ESO's case it's the live/AddOns folder, correct.
The folders are even the same if you are not using Minion, described here:
https://www.esoui.com/forums/showthread.php?t=8858
And here:
https://www.esoui.com/forums/faq.php..._howto_install