Please rate my 2-phase system

I’m thinking of upgrading my 1 multiplus-II system with 2 more to accomodate a new sauna and have more stable and powerfull charging of the EV which doesn’t like the unstable voltage of our grid (even with voltage stabalizer unit!).

I’ve chosen not to have a true 3-phase system as for some reason the main line to the country side houses only has 2 live cores.
Also the EV doesn’t like the Voltage matching the Victron does when on-grid so having a separate multiplus for the EV makes sense.