This happens. They deliver the box to u, and later in the day, or the next day, they come for installing the product.Generally the technicians are very particular about signal strength, so u need not worry. But yeah, do keep an eye on it, that they dont just install "For the sake of it", without caring for the strength. WHen they had come at my place, the guys took around 2-3 hours adjusting for signal, and finally their senior came to set things right.