EV charger positioning in DESS infrastructure

Hello, I’m looking for an advice how to position EV Charger NS : on AC in or rather AC out, considering my priorities to avoid the batteries drain by EV in any situation and , obviously, maximize usage of solar excess.
I’ve got 3 phase MultiPLus with PV charger and Solaredge PV Inverter on AC Out. Also I have DESS (15 kW Pylontech) active. Sharing your experience of Pros and Cons of both setups would be a great value for me . Thanks in advance!