Those tiles are not just laying on there they should be held down by restraining wires. They do not fit flush together either there is plenty of room to place a cable between them. That white scalloped stuff at the edeges is most likely just sheet metal and not wood. Cable can be run around it also.
Having said that what do you plan to bolt the dish to?
I would not be mounting a dish to my stucco. I would go with a pole mount and then bring the cable thru the wall at exactly the place i wanted it to enter the house.
It has to be grounded.
Are you talking TV or satelite internet. This is actually an internet forum but they work the same.
7000S SatMex 5 1050, Dlink wirless