You can always use MKLINK to make a directory symbolic link. The game will still think it is storing and reading from "C:\Users\YOURUSER\Documents\Elder Scrolls Online" but the data is actually stored where you point the directory symbolic link
Move you current "Elder Scrolls Online" folder from Documents to where you want it to reside.
In Documents execute MKLINK /D "Elder Scrolls Online" X:\MyGameSave\ElderScrolls\
where X:\MyGameSave\ElderScroll is the "Elder Scrolls Online" directory you moved and/or renamed.
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