It is possible to link them, just the same way as you would link a retail units system to the landlords system via cables.
One thing to note: Carry out a radio survey before committing yourself to a quote, that way if boosters are required for signal strength they are included within your quote from the start.
Obviously connected to the radio fire alarm system will be output and input interfaces (depending on the number of signals sent and received), which would be sited adjacent the hardwired interfaces on the Syncro.
There are a few manufacturers available, altough some of the cheaper options wont have the necessary cause and effect programming capability. Depending on what the cause and effect strategy is on the site. Worth checking before hand !!