The person in that video doesn't have their wave setup quite right.
In my 125g 48x30x20" tank, two vortechs can produce about a 1" wave. I love them for wave function. Alll wave generators, they work best on tanks with a single center overflow; that have nothing directly impeding the flow.
the first time we put it on wave I freaked out and turned it off and we only have two I can imagine what four would do.
I was reading the online manual and Vortec recommends using the MP10es on the back wall if you need additional flow. not sure what I will do.
warning! make waves at your own risk. eek