I can only reference the use of an NSB, just because that is how I have my environment setup for FOH and MON. With an NSB, there is no need for microphone splitters, each console can see the NSB (when the consoles are in a "stand-alone" mode). Take a look at the links I included (below).
For your setup with the 32R, I think the 32R would be considered the main console and have full control over the inputs (gain setting and phantom power). If this is the case, the 32SC should be using the AVB inputs streams from the 32R (should be shown on the 32SC console when setting up the inputs in the AVB Input Streams area). The inputs for the 32SC should be sourced from the "Gain compensation" streams (aka GC)... not the regular streams.
The 32R does add a layer of complexity into the routing options for a FOH / MON setup. I do not use a 32R in my setup.
Not sure if you have seen these:
https://support.presonus.com/hc/en-us/articles/360059135392-StudioLive-Series-III-Setting-Up-Stagebox-Mode-with-a-Series-III-Console-and-Rack-mixer
https://forums.presonus.com/viewtopic.php?t=36027&p=211151
When I was initially setting up my independent FOH / MON configuration with two consoles and single NSB, I did not find any information on how to do that! But, what I did find helped me to determine (through trial & error) what needed to be done.
