Thanks chechito - I hope the 25mm/1" height dimension is correct (and not the 1RU/1.75"/44mm that the rack mount 2011 router is) as I only have 1.5" of clearance in my SWB location..
Looking at the product sheets and the quick start guides, it doesn't say if the RB2011xxS versions with the SFP port is a combo-port design (ie., if you use the SFP port then you can't use the corresponding ethernet port) or can be used as a standalone WAN uplink port... Sure wish these 2011's had all Gig ports