The free Cloud Standard service supports up to 10 nodes. For 20–30 devices, you would require Cloud Premium, which has no upper node limit and is charged per node, monthly or annually.

The node calculation is:
Each Vigor Router or SD-WAN Profile = 1 node
Each VigorAP or VigorSwitch = 0.5 node
Therefore, the actual number of billable nodes will depend on the types of devices you have.