Air Tank Mounting Question

[Yobyllib]

Hello,

I have just finished mounting my Firestone 9248 five gallon tank between my rear bumper and rear mounted fuel tank. I have it so that the four ports face up and the bottom 1/4" hole is facing directly towards the fuel tank where I was going to install a pressure release valve. Should I redo my mounts and clock the tank 45 degrees so that hole is pointing down and put a drain cock in it or just leave it? I will be using a Viair 444C dual compressors, will I have much water to drain?

Thanks,
Bill