I haven’t really heard people discuss setups like these such, so I thought I would start a topic on it. Have you ever found two or more of the same siren together? It’s rare, but there are some examples. Here’s a pair of two Fedelcode Model 2s in Bridport, Vermont:
https://www.google.com/maps/place/21-1+ ... fe12c05f26
Know of more? Post away! I know of a couple more, but would like to see what others have found.