Tough crowd here on this forum ... I have already contacted VitriFrigo if they have any suggestions.
Basically I want to mount the compressor to the bottom of the ducato because of noise, space & heating. There is enough clearance under it so that is not a problem. About the water spray, this can be handled in an inox box with vent holes that are not directly impacted from the water and even if some small drips of water get into the box it should not be a big problem.
I will update how it will be done if it helps anyone in the future.