Is it possible to apply different content filtering policies / rules to different subnets? I know you can apply them to vlans local to the MX, but we are wondering does anyone know how to apply it to subnets which would be behind a L3 core.
In Network-wide --> Group polices you can create a group policy and apply it to whatever devices you want. The only thing is that devices can currently only be in one group policy at a time. Here's the doc on group policies