Setup Proxmox HA for VMs with databases

Hello,
I am going to setup a PROMOX HA environment with 3 servers.
I am not sure which kind of storage to use to better support 3 requirements.
I have a lot of VMs with db (postgresql and mysql ) . I will have a lot of VM machines running on one using DB .
I need to satisfy these 3 requirements:
1) minimal downtime
If the node crashes all the VMs on that node will be rebooted on another node with downtime close to zero

2) minimal of data loss
If node crashes, the VMs will reboot...

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