I am truly no fan of containerization. I only will containerize an app once I understand what it is doing fully. Otherwise, I think containerization is merely an abstraction layer for someone who wants to get up and running quickly which is I think is not advisable. That’s my 0.02 anyways.
Have you thought about building your own? You build a server out of a case like this IN WIN. What OS do you plan to use? Do you need Windows share ability? Are you willing to go with larger SSDs instead of spinning disks? If you give me some more details, I might be able to help you. I am not a fan of Dell.