Fortinet HA interface on ACI Multipode setup.

Hi,

Anybody that is running Fortinet ha interfaces over an ACI Multipod fabric?  Are there any special considerations to be taken into account on ACI side.  Since HA is a special ethernettype and the L2 link is not really L2 in aci fabric. 

Do we need to configure anything special on ACI side for this?

Or must we use unicast mode?

Is it supported?