Yes could be good, remember that the MWG HA do a load balancing of the web traffic and that maybe will help you in your implementation
OK, But what if the Host machine has stopped working accidentally..then we will lost the HA functionality.
I don't see good reasons why you want to do that. As you mentioned, when the hardware fails, both systems are gone. It will only help if (for whatever reason) one of the virtual machines hangs up while the other remains running. Anyway it would make sense if high availablity is required to have more than one physical hardware.
that what I was looking for