Hi everybody,
First here is my diagram:
With the above diagram, all 4 devices (3 routers and 1 PC) can PING each other, but when I forward port 3389 to the Internet, I encounter the following problem:

I use the following script on all 3 routers to forward ports: But when I use the public ip addresses of the routers, only the public address of router 01 can be connected to. I can understand that because it is using the Default Gateway of 192.168.0.1 so it can work, however the purpose of implementing the above diagram is for when the internet in 1 of the 3 routers is down. I can use the public IP address of one of the two remaining routers to connect and set up a default gateway to the other router to continue using the Internet.

I tried another way that in addition to using the above script, I needed to add a srcnat with the following script to be able to use:
It worked. But I hope anyone can explain how it works and what is a better option (if there is any)
Thank you for reading and looking forward to hearing your comments

Bump

bump

Perhaps, this will help you. Read about VRRP.
Links:

• VRRP
• VRRP Configuration Examples

Perhaps, this will help you. Read about VRRP.
Links:

• VRRP
• VRRP Configuration Examples

Thank you for your reply, but I still have to follow the old diagram. Since it has to run like that, I just want to ask the optimal way