Hi Peter, I'm in the same position - I'm keen to have more information, and maybe even more control one day. I'll order a kit too - do we need any of the special wires or just the generic kit here:
Open-source hardware tools for energy monitoring and visualisation
shop.openenergymonitor.com
The Generic OBD2 cable will work, I used an RWGmobile data sim (It's one of the 100MB/ 96p mo ones) in the modem rather than included one, although I had a load of trouble with the EE one only connecting on LTE and not reconnecting if it dropped.
I seem to be getting on a lot better with one of their Vodafone based ones.
If I keep the thing I'll probably put it on a yearly plan or change it for a multi-net sim.
As for the Module itself I took the side panel off the center console and put it in the void behind for now, used some sticky pads top stop it bouncing around.
I do need to move the antenna at somepoint as it's just shoved down the side between the plastic trim and the center console.
Also no idea if control will ever be possible, getting the SOC is definitely possible, and in some builds it was showing TPMS data and a few other things.
I don't think the per cell data is correct yet but it looks like it can pull it as it was showing something previously.
Do NOT run the release build on the ZS ev profile it will cause the dashboard to shutdown! (Or at least it did on my car)