Again, if on Dish networks online form, how would they know if you are not the owner unless you tell them you are not?
When somebody hands me a permission slip, I don't even look at it and hand it right back to them.
I tell them to keep it for their protection as I do not need it.
Now, again, I do not work for every installation company out there, I only work for mine, and only can tell you that mine does not care.
But if you keep your mouth shut about leasing, it will never come up.
I know you are not trying to get around anything, could really care less if you were since the federal law is on your side.
If this answer is not suitable, and it is apparently no trouble to get a permission slip, then just get it but it won't be necessary for any company if you just keep your mouth shut or say you own the house if asked.