Question about Ubiquiti USG: UniFi Security Gateway

yes and no ^^ you can use both devices but then you have double nat which isn't really great and won't do you much good. noramlerwise you use a different router and don't connect two together for that but you would have to swap your centro with an ftth converter so that the public ip is on the security gateway. it would be easier if you could say what you want to achieve with this or why you want this product? because it is probably the wrong one :)