hello I need some installation suggestions my house I talked to the person who I am renting it from he said I can put my dish on the east side of the house and aim it south. is this possible to do, or do I have the dish physically sitting south to aim south? if so what can I use to put the dish on concreete slabs? if the dish has to be sitting south I will have to put it on my patio witch is made out of concreete your help would be greatly appreciated. Hank