Reapers are spawning over the water in MoD - in the NW and NE just of the edge.
Mostly matters with fear reapers - they spawn, quickly drop down into the water, and even if you do manage to damage them when they reset they are back at full health - so you can't get rid of them.
Resetting the instance gets tiring.
Have not bugged as by then the raid is too messy and we usually have to reset.
Edit: actually Mingle suggested putting an ice island under them. we might be able to do that...