How to install Windows Admin Center (WAC) in an unattended mode using a self-signed certificate

SysEnthusiast 
msiexec /i <WindowsAdminCenterInstallerName>.msi /qn /L*v log.txt SME_PORT=<port> SME_THUMBPRINT=<thumbprint> SSL_CERTIFICATE_OPTION=installed

https://docs.microsoft.com/de-de/windows-server/manage/windows-admin-center/deploy/install

Note: You can choose to remove the log switch as shown below.

See the following link to get a full understanding of what the syntax (commands) above does https://www.klaus-hartnegg.de/gpo/msiexec.html