Once you have the hardware, it's easy to experiment with different ubuntu installers on a USB stick.
best thing to use on a usb stick is ventoy.net. then you can just have many images on a single usb. a distro hopper's dream
Yes I watched a video on setting up a usb to boot from and install. I was thinking the same thing that it would be the server version of the Ubuntu and then install Umbrel. Will consult Umbrel Group before I finish. This is a winter project but gathering stuff.