-Looks like you're going through the sewer vent for wiring. That would work. I put an PVC conduit next to the wall in the master bedroom by the passenger side window so I could go a short route to the battery, and also was able to put a different array up and route the wiring easily through this conduit. Depending on the roof, its not hard to drill through and put a project box up. For me, the hard thing was learning how to drill through the roof, but the process was easy.
-I have a Victron battery monitor, which it looks like you could use that. I also have 3 X Victron SCCs and added a Victron 24 volt to 12 volt 70 amp DC converter when I upgraded from 12 volt battery to 24 volt battery. I don't have the lynx, multiplus, or cerbo.