Decided to install vCenter for the added functions mentioned.
6.7 installed fine and seems to work OK. Keen to muck around with nested ESXis, vmotion and HA.
Yes, apparently ESXi 6.7 does not support 65xx and 66xx Xeons, I used a Dell specific version and I probably won’t update.
Oddly enough both 6.7s trials work on vmware workstation.
Maybe something to do will Dell buying vmware.
Cheers