More than 4 CT's

I don’t know. There was, quite a while ago, some development work being done on what I would describe as a “next generation” energy monitor, but I’m not directly involved and I’m not sure how far it got - or even whether it is still actively being progressed.

If you search here for “STM32”, you’ll probably know as much as I do. Most of the substance is in STM32 Development.