MG - yup One AND Only !
SS Sure it does: carrying two engines is justified by the unacceptability of having to land immediately and supposed to render it remote. If it works then you don't need floats, since it does not work because other factors require immediate landing, then immediate landing needs to be made safe by the carriage of floats, severely reducing the justification of avoiding immediate landing due engine failure. (not to mention that some (gearboxes, tail booms, free wheel units, fuel systems, pilot confusion, engine explosions and fires) causes have actually been due to having two engines)