Some considerations include but are not limited to that rear placed engines allow shorter landing gear. Tall landing gears are heavy and otherwise not too useful if the plane is not too big. Engines in the rear also need more structural reinforcements in the rear instead of the wing only.

What about high wings, like in a BAe 146? Wings protrude in to the cabin, reducing space. Some say it's worse in a water landing but those are rare. Others say engine noise is greater in the cabin. What did you say?