BGP for cluster in VIPRION

Hi I have 2 chasis with 2 blades in configuration active/standby; I tried to configure the bgp with the float IP for up the session bgp but when i did this the session never up, but when I configure with the self IP of the each chasis the session bgp up but for this configuration I have 2 session bgp.

 

Please can you help me with the correct configuration for bgp for two chasis active/standby, and tell me if iss posible to configure the bgp for float Ip.

 

I attached an image of the topology where ddos are the F5 devices.

 

Thanks for your help