I’m running proxmox on that same machine with a 9 node k8s cluster serving zabbix, zammad, coreDNS, three Grav sites and it’s also the SAN for my Longhorn implementation as It’s got a 10gig sfp+ card in it. Powerdraw sits at around 630 watts on average. It’s in a corosync cluster with an R720xd and my old gaming PC.
It’s got plenty of room for you to grow if electricity is cheap, they make great ISCSI servers and also baremetal DBs if you outgrow it completely.