The Neros are nothing like the MPxx in that regard. The Nero line has the motor and cord in the tank held in place by a magnet on the outside. The MPxx have the motor and cord on the outside of the tank and drive the propeller on the inside by magnets, which also help hold them in place along with sticky tie-wrap mounts for the cord outside the tank. The Nero pumps have great flow pattern but they're still just like most others as far as where the cord goes. *Ecotec is the mother company but they are separate entities.
(*Stock photos, not mine)
Nero mounted
MP40 mounted