Well I will comment as a person who went through one of these surveys.
I worked for an automotive dealership. It was either Chevrolet or Chrysler( don't remember which,it was many years ago) who mandated the dealership have all its employees take the survey anonymously. You filled out the survey, no names, stuffed back into an envelope and placed it in a box. The manufacturer then tallied up the results and presented them to the owner and management.
Yes it was an eye opener to everyone involved. We then worked on resolving the issues it found.
So Dish doesn't have to have the survey signed by each employee, just hand them a survey, tell the employee to fill it out , collect the surveys and tally them up. The next step would be up to Dish, meaning will they address major issues they find. The internal survey could even be conducted by an outside source.
Now that kind of survey results I would take notice of, not some minor company taking a survey result from a minor survey company.
Also I have found that owners/top management rely too much on mid management's "take" on how things are running. They need to talk to those down in the trenches doing the grunt work.