Fortiauthenticator 3000 E appliance - LACP/Link Aggregation

Hi Experts,

I've been tasked with putting together some schematics for an upcoming Fortiauthenticator install. I'm interested to know if these appliances can support LACP or some kind of link aggregation to allow the device to connect into a resilient switch stack? If not, is it possible to configure a backup interface that takes over in the event of the primary failing? I've done a bit of research but can't seem to come up with an answer. 

Any information will be much appreciated, 

Cheers

J