For what I have read more I would need at least 8Gbs more of RAM and more storage, also a second GPU (the Asrock AB350M Pro4 has 2 PCIe slots). I think for now I will go with Windows Bare Metal and a Linux VM with Atomic Toolkit and once I buy more RAM, storage and a second cheap GPU I will then move to unRAID.
@tdallen @phbigred thank you both for your answers!