Need advice: iSCSI + 3 node cluster

Hi,
I need advice whats best scenario to connect 3 node Proxmox cluster to PowerVault ME5024. NAS has 2x iSCSI connectors, and each Proxmox node has 2x10GB.
I used to have 10GB switch between NAS and cluster but now I decided to connect cluster directly to NAS. So far I connected each node to NAS like NIC1:Controller_A, NIC2:Controller_B. SO I have used 3/4 ports on each controller. I am planning to use 4th port on each controller to also connect Proxmox Backup Server.
Now I am at creating...

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