@bsrabelo,

There is a lot to unpack there to be honest.

The GX90 has a Maximum Wireless clients of 64+64+128 according to the different bands available to the model. The model also has a recommendation of 50 Recommended Clients. This means simultaneous online clients but will vary based on the usage of your network.

Your IoT Devices will not all contribute to this maximum as many will 'sleep' and not maintain their connection to your router. This is the case for a lot of lightweight IoT devices; your problems will mainly occur for the TVs and cameras, as they have the potential to always be connected depending on your setup. This is also a large reason why people use IoT networks, as it can manage your overall bandwidth and make sure your regular devices have a stable connection.

This also is only talking about wireless clients, so simply wiring a TV or Laptop can take a great deal of strain/use off of your wireless networks.

Across our Routers, you chose well. The following models all share the same maximum recommended clients

The only way in which you could grow this number is by looking at the latest Wi-Fi 7 Archers. 

I would perhaps recommend looking at our Deco Line of Mesh Systems as you may benefit more from the IoT Network, Smart Camera Options, and Increased Device Capacity of Wi-Fi 6/6E/7 Deco systems. A mesh system would also provide additional 'nodes' that have additional antennas for your devices' connection