Unless Dish Network has their own RF remotes, you will only find remotes that convert RF to IR via a basestation. You biggest hurdle is that the equipment you are looking for are dealer only. Your best bet is hiring a CI that can handle this for you. If you really want to do it yourself, then you should find a CI firm that is willing to sell you the hardware and will provide the software. The only option here is URC. The RF basestations will have multiple IR emitter ports that you can assign. So each Sat box will get its own emitter placed on the front of the box. In the software, you assign the emitter ports so that emitter 1 = SAT box 1, emitter 2 = SAT box 2, emitter 3 = SAT box 3...

This is the best/easiest way to do this outside of Dish Network providing you with RF remotes IF their equipment supports it. No third party company can control their box via RF directly. That goes for all equipment, not just Dish Network.