Flint 3 (GL-BE9300) 3 of them used to create a mesh/roaming network

[charles2]

Hi,

We have just added Mesh support for GL-BE9300 through the AstroMesh beta firmware and we also added some Astro features, such as routing traffic back home through the Astro network when you are away from home.
More information is available in this beta announcement:

AstroMesh Beta Test Recruitment: Seamlessly Extend Your Home Network Anywhere!

Dear GL.iNet Community, We are thrilled to announce the official open beta for our highly anticipated feature: AstroMesh! AstroMesh is designed to extend your GL.iNet network beyond your home — connecting your home router, mesh nodes, and travel routers into one seamless network experience. Use it as a Mesh Node at home to expand Wi-Fi coverage, or take it on the road as an Astro Node to securely bridge back to your home Main Router while traveling, staying in hotels, or living on the road. W…

If you are willing to try beta firmware, you can purchase the devices and test AstroMesh with the beta version provided in the post.
For the AstroMesh setup steps, please refer to the Quick Setup section in our documentation:

Quick Setup - AstroMesh - GL.iNet Router Docs 4

In your case, you can connect the WAN port of the first GL-BE9300 to your NBN gateway and use it as the Main Router.Then follow the Quick Setup guide to add the other GL-BE9300 units as Mesh Nodes.

If you prefer mature and stable features instead of beta firmware, you can also use Extender or WDS mode for now.
With 802.11k/v/r enabled, Extender or WDS mode should provide a roaming experience close to Mesh in many home environments.