Sadly mine is not per-socket. I have an old APC that shows load in watts for the sockets under battery backup, and also load in watts for the entire load (it's split and offers overdraw protection to everything, but battery backup only to half the sockets on the back).

Usually I just leave the new machine as the only thing idling on the sockets without battery backup and compare the two.

I also have one of these (https://www.amazon.com/gp/product/B08LD53F3P/ref=ppx_yo_dt_b...) floating around, but you have to be careful with it since it's not a surge protector. That said, it's cheap and will monitor each socket individually.