it should absolutely be center back of ANY case and make sure shit you can fit a camelback pouch in it providing your liqueur of choice, no doubt, as you shoot.
other specifics, well, what cue are you carrying? hows your car/truck look or/hike with your wood and/or where do you prefer to carry it as in up high or down low?
there are numerous of ways of hiding your matter. myself i use a folding guz, taking 5oz of intoxicant but i do look stupid suckin on the tip..