Reddit reviews USB IR Repeater - Infrared Remote Control Extender Repeater Hidden IR Repeater System with 1 Emitters 1 Receiver (3M/ 10 FT)
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High sensitivity: Remote control signal receiving real-time response to fast forward without delayAllows IR signals to pass through solid doors or walls, line-of-sight to the components is not required Confirmation LED built-in to the IR receiver acknowledges receipt of IR commandsEasy Setup: This IR Repeater System is easy to use and sets up in minutes5V USB Power Supply(Adapter not included)Control Audio Video Components in Entertainment Cabinets or Equipment Closets using Existing IR Remote Controls
I have attached a TP roll core (or other tube) to the end of the remote and aimed it at the one I want to control.
Another way is to use an infrared (IR) repeater for one of the TV's. It picks up the IR signal via a sensor and sends it via a cable to an IR emitter which is mounted right over the TVs IR receiver. Black tape prevents the remote from activating directly. The extender is mounted far off to one side. The other TV is operated normally.
Edit: A third way is to put black electrical tape over the remote's emitter or over the TV's IR receivers. Then the remote has to be held very close to the TV before it will work. We use this method on desktops with multiple TVs.