Whenever Periscope runs in an enterprise-edition context, make sure filtering by content-tags is supported. This could potentially be achieved by having an EE specific module for periscope.

Furthermore, enable the corresponding filter in FindBar.

Add an interface to core or similar and use it in Periscope and FindBar.
The implementation of the interface will be in content-tags-core and it'll simply delegate to the constant (TagManager.TAGS_PROPERTY) as well as having the necessary methods to replace usage of TagManager directly from FindBar and instead of that intermediate interface. Perhaps even having a method which checks whether the tags-module is installed or not. (optional)