It'll work just fine. M&G can email you a sheet detailing the installation. I just did it to both of our 2012 Rubicons. I have photos but they are submitted to RV Magazine for an upcoming article so can't release them at this time.
Basically, what you do is unbolt the ABS module, remove the wiring plug from it, and lift the module offto the side. You then use a die grinder to remove the plastic baffle wall between the ABS and ECM. The you drill one hole into the plastic floor beneath it and remount the ABS module next to the ECM. That gives you enough room to install the M&G module.
The M&G braking system is the best there is and it'll work well on your Sahara.