bigip redundant setup without any switches

We are planning to configure a redundant system using two clustered firewalls and two f5 (v9) ltm

 

 

2 clustered firewalls (active-standby)

 

 

2 F5 v9 (active-standby)

 

 

is it possible to achieve this setup this without using any switches.(the connections need to go directly from f5 inetrafces to firewall interfaces)

 

 

if yes How do we connect them all together without any switches?