Exchange Online Protection Standalone for Exchange 2013 On-premise

hello:

I'm about to deploy Exchange server 2013 on-premise for my company and we are going to subscribe EOP standalone. After reading the description from technethttp://technet.microsoft.com/en-us/library/jj723119(v=exchg.150).aspx , I'm confuse about how am I going to manage user.

1. Do I need to have ADFS,DirSync server ready on my local datacenter to synchronize user with EOP?

2. I just need basic spam filtering feature, will EOP work with Exchange 2013 on-premise without having ADFS & DirSync?

Thanks.