L2 Witness (WTS) third site

Hello, 

Is a L2 configuration for a witness on a third site is a supported configuration for WTS without static routes ?

For example : 

• One subnet for SITE 1
  • vmkernel on each ESXi host for SITE 1
• One subnet for SITE 2
  • vmkernel on each ESXi host for SITE 2
• Witness
  • vmkernel for management 
  • vmkernel for SITE1
  • vmkernel for SITE2

Thanks