Hi Marcoba,
I'll have to lab this up sometime. I am not sure what the impact of the management IP on the same NIC as the VM's combined with the VLANs will have, but it sounds like your setup is very similar to Dave99 (
http://wanos.co/forum/index.php?topic=150.0).
When running Wanos on the lan0 port-group vlan and a different wan0 port group vlan, the idea is to bridge the two vlans so that they are one network via the Wanos bridge. It does not really interfere with the Management vlan, so should work as normal.
Perhaps once the server and workstation VM's can communicate normally with all the devices and gateways they are supposed to, then we can look at your ESXi config and determine the best place to add the Wanos VM.