Hyper-V Replica Broker

Hi,

 I just got into a company and the environment is:

1 Cluster with 2 Hyper-V 2012 Servers.

2. Failover Cluster is configured with all 80VMs in the Roles.

3. There is no Hyper-V Replica Broker Role installed. Can I now start install the Hyper-V Replica Broker Role? Will this cause any issues?

Reason is: Once Server 1 restarted, all VM migrated to Server 2 but never migrate back to Server 1 so all 80 VMs stayed on Server 2.

Thank you

Tuan