@Rich54 offers a great tutorial. As in all things Photoshop, there are multiple ways in Photoshop to make an edit.
I approached it slightly differently (I'm using PS 26.9 but you should have these tool options available)::
First open a document with the car image and zoom into the trunk lid:
Then find an image of a license plate you want to use, copy it, and paste it into the document - make sure it's cropped so that any background is removed:
With the plate layer activated, hold down the Ctrl+t keys (CMD key on Mac) which activates the transform tool. A bounding box box will appear on the plate with the four corners indicated; Reduce the opacity to about 50$ so you see the back of the car:
With the transform tool still active, move the plate down towards the first black bar, Inside the move tool, you'll see a target icon. Click on that and drag it down to the left lower corner. . This will give a rotational point:
With the transform tool still active, go up to just the outside of the right upper click point on the move tool and you'll see a small curved arrow appear. This will allow you to rotate the image to get it positioned on an angle:

With the transform tool still active, drag the upper right corner down to make the plate smaller.
You can also move the plate by click and holding inside the bounding box to move the image where you would like it to be:
Now click on the check mark in the top menu to accept the changes.

Increase the plate layer opacity to 100% and you have it.
You could add a bit of blur as well to get closer to the overall image. You can also alter the size by hitting Ctrl+t again and resize using the transform tool. I don't think this needs much of a perspective change but you could warp it as needed.
