LED License plate lights splice?

[Slemmy]

Have a couple of LED license plate lights. Each has a red and black wire coming out. I’m assuming red will be the lead that I should splice to the running lights (so they come on when the lights are on), and the black will go to ground. There is a green wire and a black wire going to each tail light. Any suggestions on which wires I should splice these suckers on to?

Thanks!!

Erik