Some doubts with the multi-videobridge

Hi there.

I got running and working a Jitsi-meet server. But I will need to have more videobrige servers and I have some doubts:

1.- The multiple videobrige servers must be at the same network of the jitsi-meet server, or can be installed in other office and conect to my jitsi-meet from internet?

2.- What PC specs must be used for the new videobridge servers?

3.- I am going to use this guide for the installation, is it ok?

Thanks a lot

Gotzon