This is partly correct. If your target device is a Windows server or client, you can also install the Remote Probe directly on the target device. The advantage of this is that the scans would all take place locally and the communication with the core server would still take place over one port (TCP 23560) instead of several (for HTTP, ICMP, SNMP, WMI, etc).
However, this is only worthwhile if the target device is to be monitored excessively and is located in a "remote" network.
Sven Roggenhofer [Paessler Technical Support]
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.