DTV is changing installations. They no longer will mail equipment to a customer as there were to many calls, etc. In the Phoenix area they are replacing vendor installers with there own trained techs due is part because of to many call backs.
They (and probably Dish etc techs) are trained on home installs and likely have no training on rigs or on any equipment that is not sold by their company.
So personally I would not want those techs drilling holes in my rig. Instead consider DIY or hire a vendor that is knowledgeable with both the equipment and the rig.