IoTaWatt + Shell EM in Home Assistant?

About to get my IoTaWatt installed which will give me Grid, Solar and the major appliances (oven, spa, pool, A/C etc) into Home Assistant, but I’m wanting to get a finer breakdown of items that are on a single circuit (dryer, NAS, Computers etc). If I get a Shelly EM installed behind the GPO for these devices would that give me a reasonably accurate view? I assume I can subtract these from the IoTaWatt totals in Home Assistant?

If you need more than 14 circuits Weigh up the cost of a second iotawatt vs using Shelly devices.

In theory though, if you can get the data into the same bucket you can do the necessary maths.

https://hazymat.co.uk/2020/12/shelly-em-power-monitoring-in-grafana-influx/ Has an overview of what is needed to get the Shelly data into influx db.