@Rotan50,

You are correct, we only recommend a maximum of 10 nodes for a network. Any more than this, and the interference from nodes and networking routes will become too complicated to be efficient.

When upgrading your Deco network, keep in mind that the overall feature set is determined by what unit you use as the main unit.

If you are using a wireless backhaul, you can help your network by trying to add wired backhauls between nodes. Just remember that everything you add to the network will be potentially bottlenecked by the devices and connections between the node and the main network,  so try to provide high-bandwidth connections as far as you can back to the main node.