Hi,
There is no absolutely correct syntax for the command, it depends on your own SCCM environment, usually a command like this works:
ccmsetup.exe /mp=<management point> /logon SMSSITECODE=<site code> FSP = <fallback status point>
Specifies the /logon, the client installation should stop if any version of the System Center Configuration Manager client is already installed.
For more about client installation properties, you may refer to:
https://learn.microsoft.com/en-us/previous-versions/system-center/system-center-2012-R2/gg699356(v=technet.10)?redirectedfrom=MSDN#BKMK_CCMSetupCommandLine
Regards,
Allen