First of all, WELCOME to the Site
IF you want to get the NFL Sunday Ticket in HD, you WILL need the Super Fan package as well.
Sometimes they will give it to you free, if you ask nicely,other times NOT.
This is NOT the same as the HD fee D* charges for getting HD on the D* service, that fee covers all the channels that D* transmits in HD that you pay for.
Think of the Sunday Ticket as a separate entity, all by it's self, all charges are separate.
IF your installer says he can get the SD channels only, tell him to TRY HARDER.
The SD channels come from the 101 sat and the HD comes from the 99 and 103 says, only 2 degrees apart, this should be able to be done if he says you can get the SD fine.
I don't know anything about the wall mount your talking about .... do you have a model number or a link to one ?
The HD dish is the Slimline and they should be able to use the new 3 lnb one.
It is a bit heavier than the older ones.
Jimbo