Currently deployments of Office 365 ProPlus done by System Center Configuration Manager does not accept parametr AcceptEula from XML configuration of Click-to-Run installation.
<Display Level="None" AcceptEULA="TRUE" />
TechNet reference contain this: "This attribute only applies if you install with the user's account. If you use System Center Configuration Manager or some other software distribution tool which uses the SYSTEM account to install, then the setting for this attribute is not applied."
So user must accept Eul in first start. Problems comes with SharedActivation where every user muset accept in their sessions.
How do you handle this? Tell user "click here" always?