Hi there!
I’ve got 3 Apple TVs, 3 HomePod minis of which 1 is the preferred hub. For some reason my setup is a lot more stable on a mini. The Apple TVs over Ethernet always ends up causing no response.
I’ve got a mix of devices. Lutron Caseta switches, Meross garage opener, Tradfri bulbs, Tapo bulbs, Tapo outlets, Meross thermostat extension cord, Meross switch, Ring security system and cameras/doorbell, Harmony smart hub, string lights, rainbird sprinkler system, and various airplay 2 devices from home theater receiver to an AirPort Express 2 running my office speakers.
Running various automations for lights coming on and off, fans on and off and shutting the garage door later in the evening if we forget. As you mentioned, I’ve also got a homebridge server to get Ring into the system. It’s also bridging the Rainbird sprinklers, Harmony smart hub.
I’ve been trying to get products that only work on Matter thread but they’re harder to find. Most of my newer stuff is Matter over WiFi. I’ve got an extensive Eero mesh system that works well so I’m not too worried about over saturation.