How are you bringing the wiring in from the roof without causing a seal or wind noise issue?
The wiring harness is compact enough that it neatly stuff in the channel (gap) next to driver's side A pillar where the windshield meets.
Then up to those blocky, chunky Subaru OEM Roof rails. At that point, the harness is tucked under the rail, then the harness comes out the inside of the roof rail right where the LED bar is.
As for going from bottom of windshield into engine compartment, easy again. Open your hood, pop off that triangular piece of black plastic cowling thing, run wires under that, pop the thing back on!
Voila, you are all done, no mounting hardware, or harnesses showing. I've driven with it like this for close to three months, still good.
From time to time needing to check that harness stays seating in that channel next the windshield.
Hope that helps.