Twice you've declared what the installer wants to do. That's the definition of second guessing (determining what they are going to do on their behalf -- as their second).
Most installers are well versed in what is required by code, DIRECTV and their employer. In my state, they are also expected to have Low Voltage Electrical licenses as well that further drives home the responsibilities as well as practical and safe ways of doing things.
Installers also have to give strong consideration to where the receivers are going to be located because there are some decided limitations to how much cable you can run without having to make special ($$$) provisions.
It is like the old addage: Fast, Good (correct) or Cheap: pick any two.
Emphatic No, not second guessing. Trying to determine what the installer will want - first guessing. I'm trying to set this up for an easier install, fewer snags. Time is money.
I believe this will be much more expensive than free. I understand the installer will not put the dish where I would like, out of sight. I will do what I can to correct that, before he shows, and this will cost me time and money. No question.
I WILL have the NEC compliant ground set up, ready for installation, without additional time and cost constraints to the installer. Get in, get out, get paid. I understand the installer's point of view, completely.
To me, second guessing is questioning a decision made by someone else. I want to set this up so that there is no decision to make. I want this to be an easy job, for the installer.