Will this interfere with my trunk seal or undercarriage on bumps?

No. The Eros profile is designed to sit cleanly under the factory air dam with safe clearance from the trunk seal and lower body panels. Verify your vehicle is not equipped with Prestige or S-Line packages, which have different bumper geometry.

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

The lip is engineered to use the factory mounting locations on your air dam. Drilling is the recommended approach for permanent, secure fitment. Confirm your vehicle's OEM mounting hole layout before committing to fastener placement.

Will this lip stay stable at highway speeds?

Yes. A single-piece FRP design resists flex and vibration once properly secured to the factory attachment points. Sand and prep the surface before applying your chosen finish, and ensure all fasteners are tight before your first drive.