Yes, to your first question.
Hello folks,  i have a couple of DMX arrays that were decommissioned a while back (4-6 months ago), they were also removed from ESRS configuration (we have two gateways per site). So when i look in Configuration Tool i don't see these devices but when i look in Policy Manager they are listed as "Missing Devices". Do i simply select them and press on the button that says "Remove Selected Missing Devices" ?  Thanks
Missing Devices in Policy Manager