I have not used an Array load balancer but do have 4 Kiwi syslog servers behind an F5 load balancer. One key point, since syslog is mostly UDP, is to have the timeout for UDP on the balancer rule set to 0 if possible so each packet is handled individually and not as part of a packet stream.
For the F5 this is the reference: SOL3605 - Configuring the BIG-IP system to load balance UDP packets individually
I'd look for something similar with the Array system.