I too did all my interior cabling at my Virginia home as well as running two OTA antennas. All the VOOM and subsequently Dish Network installer had to do was mount/aim the dish and run exterior RG-6 to the wiring closer in the basement. Piece of cake.
As for my FiOS install in Texas...well, that was even easier because I had the builder hire an installation company to wire the house with the Home Theater package. A central wiring closet (panel box) was installed in our master bedroom closet. Besides the interior wiring, they also ran four RG-6 and ground from the wiring closer to the attic, and two RG-6 and Cat6 were run to a side garage. Although there is no way I would ever mount my satellite dishes atop a 35' roof, that's what they do in that area. In my subdivision, all the ONTs were installed inside the garage - ours was placed inside of a side garage and was plugged into a conveniently located outlet next to sprinker system control box. Other than putting the ActionTec router in the bedroom closet, Verizon techs were in-and-out pretty quickly. It almost took longer to authorized three cablecards than it did to get the ONT and network up and running.
To be honest, the placement of your ONT and router are up to you and Verizon...and a lot of it depends on your home (old/new, frame/brick) and where Verizon installs the ONT in your area: they install them on the exterior (at least they did) in my neighborhood in VA, but they install them indoors (prefer garage) in the Dallas area. Personally, I would run all your cables to an interior junction that is centrally located (as much as possible). If this isn't centrally located and you cannot get adequate wireless coverage from your ActionTec router, you can always turn off the ActionTec's wireless capabilities and connect it to a Linksys router using one of your RG-6 runs. If I were you, I would call your local Verizon...ask your neighbors...or take a look at the DSLReports FiOS Forums:
Verizon Fiber Optics forum - dslreports.com broadband community
Verizon FIOS TV forum - dslreports.com broadband community
P.S. I turned off my ActionTec wireless functions and connected a Linksys wireless router in my living room for a few reasons:
1. Although the bedroom/wiring was in a convenient cable location, it wasn't centrally located and could not wirelessly cover the entire house (4200sq. ft of brick)
2. I like the Linksys router better (function, UI, and gaming)
3. Could plug TivoHD directly into router and not purchase wireless adapter