Do I need a firewall when I use Athom Homey Pro?
Any normal consumer internet connection at home will do. ( technically most a NAT router, sometimes called a firewall )
Homey connects over internet to the cloud and that makes it possible to manage your home even when you are away from home
It should not be necessary to configure anything special in firewalls (unless you already have it and configured it yourself incorrect )
I even use a PiHole to block ads. Homey works anyway.