Kapex with Fastcap Best Fence Bench Mount System

[Xyrinexe]

I want to build a modified Fine Woodworking's Ultimate Miter Saw Stand for my Kapex, but want to use FastCap's Best Fence Bench Mount System instead of the Kreg fence system. I want the Kapex to be inset into the bench so the fences are sitting flush on the stand and secured using the Kapex Adapters and Fence Adapter Blocks, I do not wish to use the Bench Mount Precision Adjustment Blocks.

Here is a good video, at 57 seconds is exactly what I want to do.
=167s

Does anyone know how far I should inset my Kapex so the fences will sit flush on the stand using the Kapex adapters?

Thanks a lot!