Will this work if my bumper has existing sensor holes or cutouts?

Verify your bumper's sensor layout before installation. If cutouts don't align with this trim piece, you may need to carefully route around them or test-fit first to confirm clearance.

Do I need to paint this before installing it?

Depends on your finish preference. If you want body-color integration, paint before mounting. Raw finish can also work for contrast or custom builds—test your look before committing to adhesive or fasteners.

What hardware do I need to secure this to the bumper?

Mounting method and hardware requirements aren't specified in the product data. Inspect your OEM attachment points on arrival and gather appropriate fasteners or adhesive based on what you find—likely clips or small bolts at factory mounting locations.