@Phssthpok - FWIW - I keep my library folders, AutoAdd, PseudoDevice, UnderEdit and other ancillary folders in a common parent folder (D:\Calibre). Library names commence with an underscore '_' to group them at top of directory list.
I would advise against putting the AutoAdd folder in a designated temporary location such as %USERPROFILE%\AppData\Local\Temp because tools such a CCleaner and MS Disk Cleanup will remove it if/when they are used. I'm not sure what calibre does if it can't find the designated AutoAdd folder.
BR
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