Do these mount at the factory bolt points or do I need to drill?

They mount at factory attachment points—no drilling. Use existing fasteners from your cab and bed frame.

Will these fit with a tonneau cover or bed cover already installed?

Test-fit before committing. Some tonneau designs may interfere with the rear edge of the covers. Measure your bed cover's rear profile against the cap height.

Should I prime or paint these before installing?

They arrive ready to install as-is. If you want to match your truck's color, sand lightly, prime, and paint before mounting. Install after finish is fully cured.