SliderPLUS v5 cannot be attached on top of a Pan PRO to rotate the whole setup. We recommend mounting the SliderPLUS v5 directly on top of the tripod and placing the Pan PRO on top of the slider. You can see an example of what the setup may look like below:
Since SliderPLUS v5 can slide twice its length while being used on the tripod, the slider's stability becomes more dependent on the support provided underneath. That's why we recommend SliderPLUS v5 to be mounted directly on top of the tripod. Pan PRO is not designed to be a panner for SliderPLUS v5.