Hi Yovar,
If you are using the braided Cat5e cable then, probably putting these lugs would not be on issue even if the ground bar or ground bus bar is located at the foot of the tower. You can use a larger diameter size grounding cable to terminate these lugs down to your ground bar.
We have similar installations - however, instead of using the braided cat5e cable, we use outdoor rated Cat5e cables with “take note” w/ “STATIC DRAIN” wire included within the cat5e cable itself. Then use RJ45 connectors with grounding, this is where will gonna terminate any surge for both your ODU, PIDU including your LPU.
http://www.platinumtools.com/products/100022.php