This has been discussed quite a bit already on the forum. All IR requires line of sight, except that sometimes it can bounce off objects if the signal is strong enough.
http://youtu.be/YHyiobPXGwU?t=14m19sThe UUIRT has a blaster on the front (built in) and extra ports on the back that you can attach a cable to for small short range emitters that you can run directly to the device.
The iTach also has multiple ports and you can attach short range emitters, or blasters to them.
Maybe you should look at the UUIRT web site.