I want to ask
what advantages give having to engines in that position? wouldn't it be better twin engine (normal configuration) or single engine?
Compared to a regular twin-engine type, it has less drag, and you get an aircraft that's somewhat more compact and thus maneuverable.
Conversely, planes with this layout tend to be a bit cramped (two engines stuffed into the same size airframe as a single-engine plane) and they become dicey prospects to bail out of in case of damage.