I think it's got two vCMPs on each blade, right?
If that is the case, you do not need a physical connection to establish network failover and trust, they communicate within the chassis, however, this type of architecture is not a good practice.
No physical connection required if two LTM in two blade but in 1-Viprion chesis(only for failover).
However you need to establish HA trust for failover. In production environment we never prefar this module.