Hello @Valnera,
Thank you for your post.
With TeamViewer, only one device needs to be licensed to make a commercial connection. This means that, when logged in with your licensed account, you are authorized to make connections to any devices where you have been provided the TeamViewer ID and password.
Rest assured, TeamViewer does not additionally charge you for connections made to specific devices, or any other kinds of connections; if you are logged in with your licensed account, you can make connections to any environments - commercial or private.
Hope this helps!