replacing vGateway (Edge gw) in vCloud director with Fortigate or Sophos VM

Hello,

didn't play a lot with vCloud director but now something came up where I have to replace vGateway from Vmware with 3rd party firewall like Sophos XG or Fortinet FG. Went over some videos but there is no mentioning that this is possible. It is always refered back to vGW,

Is there some links or docs where best practice for this type of deployment???

So, is this setup doable where Edge GW is replaced with our VM (Fortinet or Sophos)?

What is best practice for this setup?

Tnx

Edited Jan 3, 2020 at 7:50 PM