We have it installed on all our workstations and servers. Primarily, we started with it after we were hit with a ransomware attack about five years ago. We looked for something that would give us a bit more visibility as to what was going on the network, where the weak points were, etc. We had an antivirus solution (FireANT) back then, which obviously wasn't good enough on its own. So, we went looking for something that was going to be a little more granular in how it gave us visibility on the network.
We have the Cisco AMP for Endpoints Connector on our workstations, which is all done in the cloud. We have Windows Server, Windows 10 workstation environment, and on-premise servers at the moment with some cloud. I guess we would call ourselves a partly hybrid business, with some stuff in the cloud, and all our access points have Cisco AMP on them. This currently includes work-from-home devices, because we have a lot of people still working from home with the coronavirus thing going on, even home users have Cisco AMP as well.
Our operating systems, whether they be Linux, Windows, Mac, or Google Android, are well-protected.