Full Mesh VPN

Hi,

I'm new in this world, but I got a project where I need to connect some Fortigates between a VPN connection.

I have researched a lot, but I'm a bit confuse. In fact, I need to connect every Fortigate with all of the rest of the company, but they need to maintain communication if that link were broken. I mean, set up the Fortigate to choose dynamically which tunnel is the best one to go. 

I think I already know how to do the tunneling, but I'm not sure if only connecting them by a Full Mesh topology of tunnels they will have that redundancy.

Thanks and Regards