Grid placement.
The lower grid is attached just above the 6" high Coroplast wall at the 4th grid hole up from the bottom. The upper grid is attached 2 grid holes higher than the first with a slope of just 2 grid holes.
This might be the way I have to go! I have been struggling with a ramp because they like to racetrack around the outside, and how dare I put something in their way!
