Mirroring

This link does not contain any mirroring services of CEPH.
Yes, because CEPH doesn't care about your services. CEPH is a network storage, you only store your virtual disks on it. Really, you should check what CEPH is or not.

If you want to have HA you need a minimum of two nodes and three Monitors, otherwise it will not work. Normally you should start with an odd number of storages and monitors, at least a minimum of three of both.
 
Yes, three PVE nodes where you can install three CEPH Mons and use them as HCI.
 

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