Thanks for asking. I strongly suggest that you buy the Progressive Industries EMS unit
instead. This has a Lifetime transferable warranty and is Made in USA. The Surge Guard you're looking at has a one year warranty and is made overseas somewhere. I was under the impression that CW was doing this $29 install deal on just about anything.
Especially if you're having someone else install it, I would get the hardwired unit. They can't "walk away", are out of the elements, and have a handy display to show you what's going on.
As for roof-mounted Sat dish. Nah. They cost a fortune and when you park under trees, you can't use it. Stick with the Tailgater you have unless you are in a Motorhome and want to watch TV while you're moving. (If the Tailgater isn't meeting your needs, go to a tripod and dish you can align yourself.)