Those are guide points indeed. Two for direct plate mount, and two for a plate frame/holder. Look carefully in your glove box. There should (may) be two screws in a small plastic bag. They look similar to wood screws but a guide hole probably makes life easier. I'm told that sometimes the screws might be under the rear load floor. It is also possible these are added at the port and they don't waste ten cents on cars headed to rear only plate states.
2018 Kia LX HEV Metal Stream with Advanced Tech