The Swiss Army Knife of Fencing Tools | The Straightaway Tool

Meet Collen Schenk of Mr. Fence Tools, introducing The Straightaway by Mr. Fence Tools!!
The Straightaway is a powder-coated, blue steel track system designed to be used with stick-built wood fence installations. When combined with our specialized installation method, The Straightaway can dramatically increase productivity and accuracy.
Mr. Fence is dedicated to improving the quality and workmanship of fences in the world. We specialize in helping fencing professionals become more efficient and organized, and take their fencing businesses to the next level!
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[@jasondowd7077]

I ordered this 2.0 and think it's a great tool but wasn't able to use it for my fence build yet. My top rails or runners (2x4s) were too high or close to the top of my 4x4 posts so it wouldn't work..
So, my questions are:
How far (minimum) is needed for the pickets to be above the 4x4 posts so that there's clearance for the 2.0 to be used? Thank you.