I just built a Server almost using the same parts. Its the ASRock J5040 board, 16gb ram (yes it works) a 500gb m.2 as system using a PCI adapter , 2x4tb ironwolf as ZFS mirror pool, 350 W power supply all in the node 304 fractal case for 550 euro.
Runs proxmox as hypervisor for VM or Container. As example LXC running container for motioneye, jellyfin, pyload with openvpn and syncthing.