Bart,
You can get these from lots of places, prices vary on Aliexpress now I found this - Pzem004
Not sure what you mean about green terminal block ? This device has screw conectors built in.
And also not sure how to connect N of these devices to a single phase
You would need to connect the mains voltage feed to each pzem, to the same phase that its loop is connected to.
Some usefull info here - https://github.com/arendst/Tasmota/discussions/10567
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