This will not work.
Even if you choose the option "allow virtual machines to be powered on if availability constraints are not met" HA would failover one VM at a time untill the destination host runs out of resources.
I believe Duncan's book and blog post - which you are following - also has abundant case senerios that details why this will/won't work.
You can also refer the Resources and Availability guides from VMware's doc set
www.yellow-bricks.com
www.vmware.com/support