@Shatneyman don't take what i said/will say as gospel, get input from others as well.
I am just pointing out what "COULD" be an issue from a theoretical stand point, If you have 2 2 Ohns and 4 4 Ohms in parallel the result is equal load at 2 ohms but sounds quality would be terrible (in my opinion) since you have too much front and nothing but subs in the back.
As i said i have never done a wiring like that so i can't say for sure what the end result will be.
If i was the one doing the wiring for 6 speakers, the way i would do it is front and Headpods connected to the
Alpine 4 ch amp as Front and Back, then i could hook the middle pods to a separate amp as "back" channel and dial the crossover frequency to Low Pass.
ps..I got an email saying my pods are on their way, i don't have the PRP seats but i will take plenty of pics of the pods once i get them.