Does this have fog light cutouts or sensor holes already?

No pre-cut openings. You'll trim fog holes and sensor cutouts to match your bumper beam and parking sensor locations—reference your OEM bumper hole positions as a guide before cutting.

Will this work with my lower valance or undertray?

This bumper cover is designed to integrate with factory lower valance mounting points. Verify clearance with your existing undertray before install; minor trimming of the valance may be needed depending on your setup.

Should I paint this before or after installing it?

Most builders prefer to sand and paint off the vehicle, then bolt on the finished piece—easier to get full coverage and cleaner final fitment. Install afterward with factory hardware.