Help on setup for CNC Shield v4 + Ankermake M5C

I waited too long to buy a chameleon, so now I am building one myself for my Ankermake M5C.

I have seen another person do it on this printer, but they did not say some important details, like what they did for the custom code to hit the switch and how they mounted the switch.

As for the CNC Shield, I got a v4 (the one that uses an arduino nano) so I could setup the chameleon with the other parts. I haven't used an arduino that much, and need some big help figuring it out (changing the pins in the arduino sketch)

Here are some additional questions:

-Does the work well with the M5C at all?

-Do you need GRBL on the arduino before adding the chameleon firmware?

-I have a limit switch that has 3 pins out. The CNC Shield only has 2 pins for a limit switch. How do I connect it?

-Where do I find what pins are where, what numbers they are, and where to put them in the firmware?

-Are there any good tutorial on how to set this up with the Shield v4? (I do know how to assemble the chameleon, thanks to the video from Chris Riley)

-For anyone who has set this up with the v4, can you attach images and say on how you did it?

-Once I have it set up, is the purge tower something that PrusaSlicer incorporates automatically? Or do I have to code it in myself.

I know this is a lot, I am sorry for that. I am only asking for this because this is the only (affordable) way to get multicolor printing on the M5C. After I get everything ready and working, I will try to make a full length tutorial on how to set it up the simplest way.

As I said earlier, sorry for this being a big amount of questions. I will appreciate the help.