The best way to do this--for others considering it, is to get Dish's approval for the 2nd H3 on the same account BEFORE you do anything because they have installed 2nd H3's--all parts to support TWO H3's and Joeys and all labor--for you either at the one-time upgrade or not and with the cost of you buy the 2nd H3 either through them (too expensive), or a 3rd party for the MSRP like on-line retailer many here have used. The One-time upgrade fee really is LESS expensive than getting all the support equipment yourself.
Dish is NOT likely to allow the 2nd H3 on the same account for new or more recent customers. Dish has made exceptions for customers who have been around more than a few years and customers who subscribe to the higher packages. If one does not meet those attributes, then the only other way NEW or recent customers have gotten a 2nd H3 activated at the same residence as the 1st H3 is for Dish to put the 2nd H3 on a SEPARATE account. Not the preferred option.
What I've heard is that Dish is ramping up production of the H3 and until inventories improve, they are avoiding installing and approving 2nd H3's on the same account.
From what I've read, it sounds like the OP did not line up approval before all this time and effort and money spent. This is Charlieville and Dish could very well still say, "NO!" for their own strange reasons to the 2nd H3 even if it cost Dish $0 in equipment and labor. Also, Dish may still insist on "installing" the whole darn thing because they want to do it right--of course contractors often don't do it right, anyway, but it would be on THEM--Dish--should things not work, but for them to trust a customer install and have to pay fix the mistakes (in Dish's view, not the the OP has made any mistakes) that will cost them money, anyway.
For anyone out there: has Dish changed its attitude? As a rule, it used to be that even if you bought and paid for all the equipment and performed the install yourself, only requiring a mere hit, Dish would still refuse to authorize the 2nd H3 on the SAME account, but would send the hit if you put the 2nd H3 on a SEPARATE account.