How is that possible ?
Before installation just ask the technician which is the best place to install the dish to receive the optimum signal level
He will advise you and install as per your satisfaction. Though I am not sure if you can reject the installation if you are not happy with the signal levels .
See you will get channels even if u get 10% level but then it’s not justified right …
I am not sure about point 6 as I am not from Tamil Nadu