Don't be fooled into believing that just because an aeroplane looks like a flying boat, it will necessarily behave like one in a ditching. (146 type etc).
I remember reading a report on a C130 ditching off the coast of Vietnam. Premeditated, ideal conditions and observed by another aircraft at close range, it left a wake estimated at 75 yards long and nothing else. Not even a few bits of wreckage.
Over the years I have noticed that the ones that get away with it to some extent seem to be in the landing configuration. Maybe the low speed and little fuel on board contributes.
Don't worry about the under-wing engines digging in by the way. They are all designed to flip upwards and depart over the top of the wing. It will be the underside that splits, opens and digs in.
Had the Ethiopian 767 Captain not been under a personal attack as he ditched and been allowed to keep the wings level, the result might have been even more successful. As it was, the aircraft dug a wing tip in the sea first.