The best way to set ur824 for my applicaton

Hi guys, im installing background video stream for live-event, we have camcorder with HDMI output, it comes with audio, sofor background video we use HDMI Modulator with QAM output, so there are two options - to plug UR824 right after camcorder or to plug it after TV wall as each TV set has audio output. What is the best way to do it?