Don’t forget to make use of Wifi 6 router you have to have Wifi 6 devices so usually it’s a waste of time and money for most people. Chicken and egg problem.
If you have ethernet anywhere upstairs, I suggest putting your old router up there in AP mode and dedicating it to the IoT crap on a guest network with a different SSID and channel. Easy cheap way to segment your network and protect yourself from a lightbulb that was never patched offering an entrance into your LAN.