Setup gl-axt-1800 with express vpn for miami

I was able to connect my router to express vpn and downloaded the miami.ovpn file. However when I visit What Is My IP Address - See Your Public Address - IPv4 & IPv6 I still see that i’m in south america.

How can I make this work so that all my devices that connect to the router can look as if they are in Miami?

Is the public IP shown on when VPN enabled the same as VPN disabled?Where does the IP located depend on the VPN server.