Paste the point onto your map. The placeholder has at least 6 spawn points in a radius around the intersection at this point. It took 6 spawns to get my robe. Used Bard Song of High Sun on each placeholder. If you sit at the point below, the placeholder will aggro regardless of which point it spawns at. Also confirmed a 12 minute spawn, not 18 minutes as posted elsewhere.
P 443.6651, -178.6980, 0.0020, 240, 0, 0, 2, Jungle_Hunter_(Unadorned_Bone_Woven_Robe)