Sounds like you have a good handle on things. If you do decide on the 2S2P config for 12 volt panels, then you can always go up to 3S2P.
I have four Victron SCCs now. 3 For the RV. Two are on the roof, The 100/50 for a 600 watt 3S2P, 100/30 for a 350 watt set up, and 100/30 for a 400 watt portable panel. Better planning could have got that to One SCC for the roof, and an additional one for the portable panels. The last SCC is a 75/15 for a portable generator set up.
One plus for the 150 volt Victrons is they can be upgraded to a 48 volt system. If You see yourself going to 48 volts, that maybe a good choice. My 24 volt upgrade would be a 48 volt upgrade, but in part my 100 volt SCCs only charge 12 or 24 volt batteries, not 48.