Shelly EM has a CT clamp that can be put on the main tails from the ESB meter to the fuse board this can be done in side the fuse board and the Shelly EM also needs to be wired to the mains. I have mine wired to the MCB/RCD/RCCB that feeds one of the lighting circuits in my house
For ESB, after trying to get data from ESB itself and process it in HA via InfluxDB+Python I turned to Frient device which works great for the Smart Meter used in Ireland by ESB Networks, it worked out of the box and super easy to install, uses ZigBee (so needs Zigbe2MQTT) and battery last 2 years
In situ:
