That's a good video. That dual controller looks great.Lol, I meant Gerbing not Gerber.
See here at about 5:40
Some people mount the controllers on their bikes and others keep them in their pocket or like video showed, clasped off a belt. Personally I like to mount it to my brake fluid reservoir, so that I can make adjustment while on the move and keep my eyes on the road.
In the pic below, it's the 2 little dials on the right side of the pic behind the brake fluid reservoir.
I tried out the hippo hands thingy's and they will work once I cut two small holes and install some grommets for the mirrors to get mounted back on. They are surprisingly comfortable and spacious inside.