How to make multi-siren system

What is the best, free (if possible) way to make a multi-siren system?

You could use [Release] ELS FiveM | Server Sync | Lights | Sirens | Custom Patterns

this is the best multi-siren system I know so far and one that is free

i use non els cars. so many servers i been in have 5 siren systems and want to make one for my own server