RHEV-M running as a HA Cluster

I am trying to setup  RHEV-M to run as a HA cluster. I am following a document I found from this site to setup RHCS HA cluster.

I have 2 hosts running ricci and RHEV-M running on a HA-LVM. I am not going to use this host for any other purpose other than running RHEV-M. Reading through the documentation it is not clear if  I need a third host to run the web ui luci. Is this true? Do I really need 3 hosts?

If i run luci on one of the hosts and if for some reason that host is down, do i lose the cluster failover capabilities?  I can understand if i will not be able to make any cluster changes while luci is down. Will this impact the function of RHEV-M  in any way?   

Also my understanding is once the cluster is setup the way i need it, i dont have to login to luci for any reason.. Is this a safe assumption?  If so can i shutdown luci once the clusters are configured?

When a failover happens i see messages letting logged in /var/log/messages. Is there a way to send these out as SNMP traps?

thanks

Ramesh