Hi there andy,
When I first fitted mine , it was located in the rear near side. But that lead to me discovering quite a bit of tin worm that lead me to cut the back off.
I only fitted Rear Locker, as you are fitting front as well you need to find a convenient spot where both pipes flow without any really tight bends.
here is a link link to Marks write up.Good idea to read this as long term you may wish to fit other items, so plan ahead to avoid conflict of space.
Slow and steady, plan it well and all will be fine.