You can do this for monitors using the monitor tile on a server by server basis.
Simply create a new perspective on a Server and chose the Windows Server class or the All Windows Computer group for the scope of the perspective.
Monitor tile > icons.
Set the scope to Custom > Children > All Levels > Class: Object
You can then use the filter configuration to remove all “uninitialized” monitors.
You can also do this against a group, but the results are slightly off because of the way the monitors are displayed (displayname, no path, multiple objects with same name etc.)
Unfortunately, you cannot do this for rules in SquaredUp. Ultimately, you can drill into any object and view the Monitored Entity perspective, which displays all monitors and all enabled rules. The only caveat is that it displays these only for the object you are looking at, not it’s child objects.