Rancho's 9000 adjustable is an outstanding shock, the MX6 is an ok shock but between those two, I wouldn't even consider the ProComp. Yes, I have run both of those.
For 2" of lift, especially since you have the longer wheelbase of an Unlimited, you need nothing else besides the springs and shocks to prevent vibrations, you should not experience any vibrations which a SYE/CV "thingy" is installed to cure. So no, you will not need a SYE or CV driveshaft at all.
A rear cam allows the pinion angle to be changed but you don't need it since you don't need to install a SYE and CV driveshaft. That said, a rear cam is a bad choice of methods to change the rear pinion angle anyway. They are a PITA to install but worse, they have a history of not being able to hold their adjustment... they slip and cause problems.
By the way, 4WP is not exactly a great source for good solid tech advice. Most guys at the counter are just kids who let others build up their trucks. Generally speaking, most counter sales people have very little actual experience with what they sell. I know, I used to work for their parent company and I knew a LOT of counter sales guys. Only a few were competent on Jeeps.
If you're close to San Diego, come on down and I'll install it for you for way less than what ProComp would charge.