Unfortunately these are totally irrelevant for IoT on 2.4GHz band 
I agree with orange-assistant that a more basic model, or even second hand should do the IoT job just as well. I personally opted for a new router which can run openwrt to keep my options open.
IoT devices are generally low bandwidth (only send short messages); however I would suggest you look closer at the bandwidth required for cameras; specifically video resolution x color depth x frame rate. For example 800x600 x 16bit colour x 10 frames/second = 9.6Mbps per camera just for the image.
Then add overhead and consider congestion … and that is what you know about because you are putting it on your LAN. Goodness knows how much interference is being generated by neighbours using the same frequency.
You might be better off considering several cheaper WAPs wired back to your router/switch to spread the load, or maybe a “mesh” system if it uses a separate channel for backhaul.
Whatever, you can almost guarantee that your mileage will vary from whatever the manufacturers and salesdroids tell you - it is your job to make sure it works for you in your environment.
As for EAP653 - I am renting, so didn’t even consider any ceiling mount devices.