Hi yah, I have a GW, 2 x AIO and EVC.
Yes I would wire it into the EV slot in the GW as this would then work better with your AIO and not drain them to the EVC, via the GE ecosystem. It he can also just swap it with the zappi, where ever that was installed.
I would also recommend using RCBO and a GEM120CTM
Here are the before and after photos, I had all the CRD’s taken out and replaced with RCBO’s to stop any tripping on the future and when the grid goes down.
Here is what GE sent my installer. He will also need the latest install document from GE.



