Do these mount at the factory fog light location or do I need to drill?

These are designed for the factory fog light openings — no drilling required. Use the factory mounting points and you're set.

Will the smoke lens look right without tinting the headlights?

The smoke lens on these fogs has its own tint, so they'll work standalone. If your headlights are crystal clear, the fogs will have a slightly darker appearance, but that's common with modern fog light designs.

Does the wiring harness run through the bumper or under the hood?

The harness runs under the hood to keep everything clean and protected. Route it alongside existing engine bay wiring and connect the switch to your dashboard or steering column — exact routing depends on how you want to run it.