I hear the 'double chance of engine failure' line a lot from Pilatus and TBM. And it hacks me off every time
Yet it must be true, that an engine failure in a twin must be 2x more likely than same in a single.
This is nothing to do with turboprops, but it must be equally true for them (TBM v. a King Air for example).
And remember even over the Alps while there might be spot heights up at 16K the everage will be much lower with valleys much lower still.
True, which is why I qualified it. Your ROD with a dead engine will be lower than with a SE, and will be only down to the SE ceiling which will probably be OK in most of Europe.