I switched to RF and I will never go back; I use some pretty lengthy macros, and the frustration due to missed commands will never be missed.
If you don't have more equipment than you listed, I would run individual emitters to the units; sometimes the ir receivers are labeled, otherwise you can find tham easily by running the emitter across the front panel while you send commands.
Another option is to enclose the shelves or use a cabinet; some people have had luck mounting emitters or blasters on the inside of the door, or adhering some reflective tape to bounce the signal to multiple pieces of equipment.
If you don't have more equipment than you listed, I would run individual emitters to the units; sometimes the ir receivers are labeled, otherwise you can find tham easily by running the emitter across the front panel while you send commands.
Another option is to enclose the shelves or use a cabinet; some people have had luck mounting emitters or blasters on the inside of the door, or adhering some reflective tape to bounce the signal to multiple pieces of equipment.