Welcome to the Community,
you can basically use any license, even the free Hypervisor license.
However, please keep in mind that the free license has a limitation of a max. of 8 vCPUs per VM, and restricted API access, which prevents from using most commercial VM based backup applications. In case you wand/need backup access, an Essentials Kit license will do.
Please note that ESXi 6.7 is not supported for your hardware. According to the VMware Compatibility Guide, ESXi 6.0 Update3 is the latest supported version.
André