best pathway would be make sure second and third string can be placed without moving 1st string. Just make sure you have additional room for future breakers. Also, monitoring with these DS3-s microinverters might be a challenge, whereas Enphase has a nice interface that is consumer friendly -...
I have a XW6848pro with some screenshots - I followed the signatureSolar youtube guide to add BMS with upgraded firmware and appears to be working propert
speaking of very different recommendations of charge voltages, I have three EG4 LiFEpower 48v 100AH each that I just connected to my Xantrex 6848pro, what are your charges settings? attached screenshot of my current settings