insert point on M32

What is the best way to insert outboard processing equipment? I want to insert an outboard digital EQ & processor on my L, R, & S. Those outputs are feed via my digital snake out of my DL32. I found YouTube videos online but I am worried about not being able to feed my outputs via my digital snake. I am worried if I feed my outboard gear at FOH via the Aux In/outs I will not be able to send my L, R, S signal down the digital snake. On a normal console, I would just use the Insert connector located on the back of the console. Is it possible to use an insert cable out of the Aux Out port o the outboard gear?