silent install but miss already on pc's

hi all,

how do i install sophos endpoint protection but miss pcs with it already on

https://doc.sophos.com/central/Partner/help/en-us/Help/Deployment/WindowsCommandLine/index.html#message-relays

do i need to add "no competitor removal" to miss all the pcs with it already on, i dont want the install to hang on a pc with it already on as im going to kick off the silent install on a number of pcs

thanks,

rob