Consider a NUC style device, like a Protectli Vault FW4B, and install opnSense or pfSense.

I have not used Firewalla, but from the screenshots the interface looks more simplistic than what I would expect from a several hundred dollar dedicated router. It may not be able to do everything you want. OTOH, pfSense or opnSense may have a steeper learning curve but more capability.

A note about ZigBee, Bluetooth (LE or otherwise) and WiFi. They all use the same 2.4ghz frequency band. They do not communicate with each other, but they CAN and often DO interfere with each other. The neighborhood I moved into a year ago is nothing but single family homes, but I can still see anywhere between 6 and 10 WiFi networks in addition to my own. That’s not including anything else my neighbors might be using that uses 2.4ghz. Think wireless headsets, baby monitors, and the like.

I struggled with my ZigBee mesh working for a while, and then randomly some battery devices would just stop communicating. This was the worst with ZigBee wireless buttons. They may work again, if you press them 5 or 10 times. Even some wired ZigBee devices were struggling with delayed signals.

Give serious consideration to Zwave if you browse for WiFi networks in your home and see more than one or two neighbor’s networks, or if you can see your neighbor’s Bluetooth devices when you try pairing something to your phone. Zwave uses the 900mhz band, which sees MUCH less use these days, especially since 900mhz cordless landline phones are pretty uncommon now.

Whoever is downvoting posts critical of Home Assistant, YOU are the problem. How DARE people not like what you like. The audacity! /s

I switched to Hubitat after starting with and using Home Assistant for years.

The Hubitat dashboard is a bit of a basket case. Having to mess with widget spacing and scaling by hand, and not having it adapt to the size of a device display is really silly. The stability is the difference however. I have not had to remove and re-add a device since switching. My devices and automations have worked flawlessly, and the management UI is laid out better than Home Assistant. My impression is that Hubitat focuses the vast majority of their efforts on ensuring ZigBee and ZWave reliability. This very much improves spouse acceptance.