How to make a VPN with 3 different homes and 3 OPAL SFT1200

I have 3 routers OPAL SFT1200. I need to make a private VPN to share content with family. I have a NAS connected to mi principal router and i like to share this content and my netflix account.

All members have an internet connection with fiber connected to a principal router in each house.

I connect RJ-45 to WAN port to and i have local ip, no public ip.

I try to make a private VPN following this steps: How to Set Up an OpenVPN Server on a GL.iNet Router - YouTube

But Open VPN app can't connect.

Can i set up my OPAL like a VPN server and my other family connect to my server and share content and netflix?.

THANKS.

Due to the architecture of the GL firmware (only 1 VPN server + 1 Client possible) you will need to choose one of your devices as the "main" server and connect the other 2 to them.

Use WireGuard instead of OpenVPN.

You need to make the port forward correctly.

Pls post details.