Welcome to the world of BBQ, some say it's an ART!
You'll get many different answers, because not everyone will use the same process/technique.
Myself, I prefer to cook the roast real slow, which causes a more even heating. With that in mind, I too place the probe in the deepest area of the roast.
I then follow my by a hour-1.5 hr rest. It is then reverse seared for 10 minutes in an 550* oven.
This process all allows for a more evenly cooked roast, which will allow me to pull at 130* before the searing part.
Smokin' always said not to wait for the big dance to practice first.