Maybe this is some kind out of the topic but I lost some hours trying to make an ESXi 6.7 VM and when it's instaling the DSM is crashing on "Can't Format the Disk (35)" error.
This happens because the XPEnology were booting up via Baremetal options. So if you want a VMWare VM you must comment out the "bare-metal" lines in grug.conf as said on the tutorial here. After that done, you end up with only one boot option and all goes nice. Hope this helps anyone.