vSphere is licensed by physical processor sockets, i.e. 3 hosts x 2 CPUs = 6 CPU licenses. Except for the Essentials Kits (which have the mentioned limitation), you can use hosts with any number of sockets up to the supported maximum, provided you have a license for each socket. In previous versions, there was also a limitation for the number of cores in the physical CPUs and for the host's memory, but such limitations don't exist for the current version anymore.
André