From what I understand ATI Aquaristik makes "household lights" in the eyes of the regulations. As soon as you mount it on an aquarium, it becomes an aquarium light. If it becomes an aquarium light it requires waterproofing to some degree. This (from my understanding) is why ATI Aquaristik (Our German counterparts) have never made tank mounts.
Yes, I’m aware. I’m not worried about tank mounts. It’s any mounts in general that ATI never comes out with. Something to easily hang 2-3 units cleanly