I know where it goes only there is a hole at the front of the Vib-x and one at the back of the Vib-x. I put it on the back, which was a little different at first but I'm getting used to it and actually like it.
Got ya. The back stabilizer hole is for backweights, or to install a stabilizer backwards as you are doing. The rear mount is also handy if your installing an STS.