I have opposite problem:  WiFi Remote for Ultra 4K, and another "simple" remote with  Premiere Streaming Media Player.  It seems that both remotes use the same infrared signaling (Ultra's undocumented?), and I have to point the Premiere "down" for the lower TV to keep the upper TV with  the Ultra from getting the signal even though I have it set to use the WiFi for remote commands, and I can point that one anywhere BUT towards the Premiere. 
Is  there no unique pairing for both IR receivers, or at least a way to disable it on the Ultra's remote?