Configuring the fan network in MAAS

Hi all,

I own a 3 nodes lxd cluster where I set up fan network according to
https://www.youtube.com/watch?v=5cwd0vZJ5bw&t=842s
Has anyone tried to configure this network in maas? What should be the CIDR and gateway when adding the ipv4 subnet?

Thanks in advance

Mateusz