first there are several different roll pans with different height mounting areas for the plate.
So even if you find a hitch it might not fit the way you want.
So find a shop that makes hitches, (any major city should have them,)
And have them build what you want where you want it. might cost a small amount more, but will be better than quessing.
Have a plan on how to mount your Lic plate.
I have a metal plate that the hitch goes through, so my Lic plate is just using the "dealer magnets"
super fast and easy to swap, then I just stick it to the tail gate when towing.