This guy works the same as Darkness, He spawns every hour at one of the 3 spots on the map. Their are no mobs / ph's in those spots. It's a timed spawn that has nothing to do with Ph's ect. So you can still "camp" him it's just timed rather than the usual way of poping named. I suggest the hallway leading to the very back room as you can get to 2/3 of his spots from their without having to even kill anything.
Also, if you don't touch him he will despawn after like 10 min or so, maybe 15. The 1 hour timer resets on his death if you engage him. So basically if your "Camping" him, it will work out to be more like 1 hour and 10 mins each cycle or however long it takes you to enguage / kill him. Hope this helps, GL all.