Yeah, in Pennsylvania, front plates are not required. I hate getting a car that has been drilled for front plate and has a cheap factory plastic mount riveted to the front bumper cover. Luckily, my Crossfire is intact, my 2013 SRX had one, I removed it and got the little plastic trim plugs, and touch up painted them to cover the holes.
My 1967 El Camino has plate holes and a flat spot on the front chrome bumper, so I mounted a 3rd party plate there.
I liked the 90s Pontiacs (I think) with the removable center trim for a plate.