Are you planning to have the new machines install the agent? For my solution I went through the steps for the manual agent installation and used that to create an SCCM application that gets installed when a new workstation is imaged. If you don't have SCCM you could instead create a script that installs the agent if it isn't detected.
Thank you for your answer!
Yes, I plan to install an agent on the new machines. But my problem is above all to add the new machines in a particular group.
Machines without agent are just a way to identify new machines.