The Active Roles Synchronization Service is required to be installed on a SharePoint host to allow connection to the SharePoint Server system.
The Active Roles Synchronization Service can be installed in either Local or Remote configuration. If installed in Remote configuration, you can connect remotely to this Synchronization Service from a separate Synchronization Service when configuring the connection, inputting the IP address or FQDN of the host having the remote Synchronization Service installed.
When configuring the connection to the remote Synchronization Service, you will see the following message, "Ensure that Microsoft SharePoint 2013 is installed and configured on this computer.". This message can be ignored as you will have the remote Synchronization Service installed on the same host as SharePoint.
For more information regarding connecting to Microsoft SharePoint, please see the Active Roles 7.0 Synchronization Service Administrator Guide: