Hi, I was there last year and Im so excited for you! It will be an absolute blast!
I don’t think renting a car on the states side will work, because to drive across the border, you need to have your name match the name that your car is under. Maybe if you find a certain rental service this can be avoided, but I doubt it. I have, however, seen people fly into Monterrey and rent a car from there.
What else are you wondering about?