Anyone Installed Multiple Reverse Cameras on Garmin 760LMT?

I have a Garmin 760 LMT Found Here and it comes with one wireless backup camera. I'd like to add a couple more and I'm wondering if this is possible. From what I've found online it is but I can't find much info on doing it with this device. I have heard and read about a multiplexer but I don't know how it works with the Garmin and what I'd need to do. Maybe someone has done this or can at least explain if it's possible or not? Thanks for the advice.