Can users share an Asset Folder for the Plus Library?
Yes. If you work in a team and want everyone to share the same assets, rather than each individually download and install them, then you can store them on an NAS drive and have each user set their Asset Folder path to the same location.
Warning: It would be wise to have only one person assigned as the 'downloader' of any new assets. Otherwise multiple people may be downloading and installing the same assets to the same folder.