So I have a 3-node cluster of optiplex 5060 micros with i5-6800. I have AMT enabled on a different VLAN from the hypervisor I have running and it works great for remote management. One thing to keep in mind that for the KVM access to continue to work, I had to add an HDMI dummy plugs to keep the display working after reboots. All of the other functions associated with AMT worked after reboots.

For your other questions: ATM would only be accessible from the network you have it running on without any firewall rules/port forwarding/NAT

Yes reset it to factory. Turn ATM off and reset it.

I would never open those types of services to the Internet. Wrap it in a VPN first yeah?

I have this exact model machine as a web app server running Proxmox btw. Works great. I did need to get a genuine power supply for it as it refused to run above 800MHz with a generic!

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

4 acronyms in this thread; the most compressed thread commented on today has 7 acronyms.

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