Cluster suggestion

Hello Everyone.

I am upgrading the hardwares my cluster of 3 nodes. The specs are
3 identical nodes of:
Xeon i5 2487w
256GB RAM
500GB NVME x 1
500GB SSD x 2
1TB SSD x 1
2 port NIC10Gbe fiber running DAC cables (1 on VLAN for strictly ceph private network, 1 on separate VLAN for ceph public and proxmox public)
1Gbe NIC for corosync (connected to unmanaged standalone switch not connected to network)

I have few questions in regards to the setup:
1. With 3 nodes I can have redundancy of 1 node...

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