I only have only few (less than 10) IoT devices using WiFi and they are spread over 2 fairly good access points. The rest are either wired or using ZigBee. My router doesn't have WiFi functionality itself, it's a Unifi Dream Machine SE[0] with the APs and cameras connected in PoE. It's plugged on a UPS, so hopefully the internet should still work if the electricity cuts.
Regarding your issues, I'm not an expert but I would recommend deploying more access points (pick some good ones) on the areas where your IoT devices are. Best advice I have is to wire your access points, I always had bad results when bridging them wirelessly. Although if you are in a remote area with little interference, you could get better results.
Regarding your issues, I'm not an expert but I would recommend deploying more access points (pick some good ones) on the areas where your IoT devices are. Best advice I have is to wire your access points, I always had bad results when bridging them wirelessly. Although if you are in a remote area with little interference, you could get better results.
[0] https://store.ui.com/collections/unifi-network-unifi-os-cons...