Thanks for your feedback. I also managed to test the installation on the Zimaboard, but I had no luck. Only one drive, that is, external sata ssd, is available to install. But generally the DSM 7.2 is pretty unstable on that HW—quite a slow boot. After a few attempts to install and boot the DSM, I didn't get any successful results. At the same time, under the proxmox, on that sbc, DSM is working fine.