FYI: I had a couple of monitors on the same panel for a while but what I noticed was the different voltage calibrations (which Sense corrected at my request) on an early vs late model. I have a couple of Flukes so could also see things were off. Precise placement of the CTs aside (hard), it would seem that monitor component variation would be enough to throw expectations of perfection. These are 200Amp CTs with a +/- of something other than zero. As far as the realworld “informative” aspects of having multiple monitors: having one on, say, a water heater (as I do) or other dedicated circuit is a good way of keeping the monitors “honest”. You can also unambiguously set alerts on a dedicated-circuit monitor. Having read the “Oops, I left the kiln on to burn down the house” blog post recently, I can see that there might be crucial setups where you want some redundancy.