To control devices that are "hidden" from IR signals, you can purchase an IR extender or IR repeater. You place the "eye" that receives the signals in the open and place the repeaters on/near the devices you wish to control. There are many different makes/models available on the web.
There is also a Harmony Hub option, however, I believe you still would need to use the IgniteTV remote for voice commands - not sure on that. A Harmony remote is able to properly control many devices once properly programmed. You could put away the IgniteTV remote unless you wished to use the voice commands.
I believe the voice commands (and other IgniteTV remote commands) use RF when properly paired, so the Ignite box functionality should work fine when using the Ignite TV remote without a repeater.