What a silly boat. I don't know if that's a crompton. But when you start looking into it, there's actually quite a number of various silly multiple engined boats in existence - most often looking very dodgy with armour plating around the console/cabin.
It beggars belief that anyone would consider 8 engines. To me, it shows a complete lack of understanding of almost every aspect of boat design (not that I really know the first thing about it)
It's arguable whether anything beyond quad engines is worth it - certainly I'm skeptical of anything with more than triple outboards - just get a pair big blocks. They'll be cheaper to buy, run & maintain.