For niche devices like your sirens lots of people go with multiple hub systems.
@SmartHomePrimer runs multiple hubs. 
It might be best to set up something like Home Assistant to get your sirens into Hubitat.
For niche devices like your sirens lots of people go with multiple hub systems.
@SmartHomePrimer runs multiple hubs.
It might be best to set up something like Home Assistant to get your sirens into Hubitat.