This might be a late reply but if your motherboard supports iommu you can pass your motherboard’s sata controller as a pcie device that is how my current TrueNAS VM is setup and can be a temp solution for you until you get a LSI SAS card

I used proxmox helper scripts for portainer lxc and would get my host system kernel panicked from backing up the lxc that had a NFS share mounted with fstab. Solved it with moving to komodo lxc and setting the NFS share being mounted directly to the container with Docker Compose.if you decide portainer you can set that up with stacks feature. Hope that helps.