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With the engines placed at the tip of the wings it must be next to impossible to operate with a single engine.

It has 3 engines, one is at the tail. While I agree in principle, I think having just one engine at the tip of the wing left running is going to be a rare event.

Aviation is all about remaining operational during rare events, though.

Single engine failure is a rare event that you have to be operational for. Certification generally requires you to be able to take off fully loaded with any one engine off (except single engine planes). If two engines fail you are allowed to turn the rest off and ditch wherever you are.

Remember airplanes have a fair amount of glide ability even with no engines. The airplane is coming down, but the pilot has a significant choice as to where and plenty of time to choose between alternatives and get there.

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