Below is the following Datapower Considerations:
The active appliance owns VIP 1 with high priority. Upon failover, standby appliance assumes VIP 1 traffic.
Load Balancer is used to spray traffic across VIP 1 and VIP 2. Upon failure the active appliance assumes the failed VIP.
Using multi-box management utility like WAS 7 Admin to push the configuration to Master appliance. Configuration changes propagate automatically to any Slave appliance.