Why not drill? My light bar that's going up top will have a drilled hole. Yes it's about the scariest most permanent thing to do, but just do it correctly and assure yourself that you can't mess up. I mean, align your lights and just find a necessary place to start. Measure your wires, and take a leap of faith. You can have it done professionally or teach your self and save the $$. Do it for your runner, stealth look and convenience. It's all about what works best for you, though. Running wires under trim is only asking for creating a broken seal trim was designed to prevent but, who am I to tell you. Best of luck