DungeonTools or MythicDungeonTools is required !
Both are working with that WA
https://www.curseforge.com/wow/addons/dungeon-tools
https://www.curseforge.com/wow/addons/mythic-dungeon-tools
Code comes primarily from https://wago.io/stunable
Shows on Nameplates, which Mobs are not stunnable and can detect stealth.
The Stealth Detection I wrapped out of the Stunnable WA and changed just the Variable for it. After the Renaming of the MDT Addon I customized the bugs. I tested it in Underrot with the Matrons and It works fine. Before the Renaming of MDT it worked fine in every Dungeon. So I think it will work everywhere.