This mod can be installed in the same way as other Forge mods - by dragging the mod jar into the mod folder. Read this tutorial if you don’t understand how to do this. And no, you cannot use Forge mods with Badlion or Lunar Client 🤡.
DRM v3.0 entirely relies on a combination of raytracing (to get visible blocks within FOV), the hotbar map, the player’s coordinates, and a ton of math to detect rooms and place waypoints. Read the full post for more details.
Dungeon Rooms Mod’s Secret Waypoints follows the general interpretation of Hypixel’s rules, does not modify packets in any way, and is most likely not bannable, but as with all mods, it is use at your own risk. Read the full post for more details.