No. Scripts in /etc/hotplug.d/net respond only to Triggered Network-related events, while scripts in /etc/hotplug.d/iface respond only to Triggered Interface events: LAN/WAN/etc. is connected/disconnected.
So, /etc/hotplug.d/iface is the correct place for your script.
Scripts in /etc/hotplug.d/iface will all run based on their alphabetic order (thus the numeric prefix used on hotplug scripts) when the trigger event fires. This is true of all the `/etc/hotplug.d/*’ directories whenever their particular trigger events fire.
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