Will this interfere with my trunk seal or undercarriage?

No. This is a front bumper lip; it sits forward of the trunk area and won't affect trunk sealing or ground clearance under normal driving. Check your bumper's lowest point against speed bump angles if you frequently encounter steep driveways.

Does this affect brake light visibility or cutouts?

This is a front lip — it does not interact with rear brake lights or their cutouts. No fitment conflict with rear-end components.

Should I use adhesive or drill through the factory mounting points?

This piece uses factory mounting points, which are typically bolted connections. Adhesive alone is not recommended for a front lip that will experience airflow and road debris impact. Use the factory bolt holes for secure attachment.