More details on this style of setup: https://youtu.be/6BhV-o77RqQ
Also there are some comments on that the poison they use is really harmful for marine life, so you shouldn't use it near water. Also personally not sure I like to have poison diffuser next me all time.
The point about harmful poison is very valid though. Definitely good to know and to avoid extended use. I'm less keen on buying it now, even though the protection from bites sounds promising.