Can Legrand smart switches operate on local network only?

Hi,

I am having trouble finding information if the Legrand smart switches can be operated only on a local network (maybe with the Legrand Hub) or it does need an internet connection. I prefer using devices that stay on the local network (limited by my firewall) and are controlled through HA, which is the only service I can reach from outside of my home.

Does anyone here have experience with Legrand smart switches? Can I configure it this way?

Thank you!

No one?
If the OP has more information I would be interested in this.