Solar panel wiring on Coromal poptop camper - through or around the roof?

Hi!

I have a Coromal Silhouette 391PS and notice that there is a solar power cable going from the battery compartment to inside already with heaps of length still in a roll. The question is how is this normally put through to panels on top of the roof? Do I have to drill through the roof?! I plan to affix the panel mounting rails to the fibreglass roof with Sikaflex 11FC so I was hoping to avoid any drilling at all.

Any suggestions?
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