Any tips on "risers" for Polar Power Unit?

Any tips for home made riser systems to elevate the Polar Power sensor (I think it’s also referred to as the surfboard) from the Chainstay to the required <30mm distance from the chain? I’ve seen a few funky examples on line, but can’t ascertain what people used in the construction.

Also, I heard the new polar power has a new ingenious riser system that will address the shortcomings of the current system. Has anyone seen this system?