Health monitor - multiple alias addresses

Don't think so, on my 10.2 system I did similar but only the 1st IP in the list was actually stored in the monitor. I confirmed by enabling the database key bigd.debug and watching the logs in /var/log/bigdlog. What you can do is create two monitors, specifying one IP in the first monitor and the other IP in the second monitor, then apply both and require at minimum of 2 in the Availability Requirement of the pool configuration.