Fritzbox TR064 Binding for second Fritzbox

I am running 2 Fritzboxes and want to use the TR064 Binding for presence detection and info for the box.
Have installed the binding and created a fritzboxtr064.cfg in the services folder.
What do I need to do in order to detect the second Fritzbox - it looks like the configuration allows only for one Fritzbox.
Thanks for support.