I have a polarizer for my gL2 and a Fisheye lens. I want to know if I mount the polarizer in between the camera and the fisheye if the polarizer will work the way it was designed. Or does the polarizer have to be mounted so that the light hits that first? (I would've gotten a bigger polarizer for the fisheye but they don't make a 87mm thread size for polarizers).

put the polarizer on first, then mount the fisheye.