I need to apply a Blocked URL pattern to all the MXs in all Networks for this customer. Is there a way to select all MXs to apply this or do I have to use Groups? If I use a Group setting how do I make sure it does not impact other settings like Layer 3 Firewall, Traffic Shaping etc? What is difference between "Use Network Default" "Disabled" and "Enabled". Which options leaves existing rules untouched? For example I don't want to impact existing L3/L7 rules per MX or Traffic Shaping. I just want to update the Block URL pattern across all MXs.