One thing I am curious about is the mention of the contractor for an hdmi drop? I am aware of NO hdmi splitter packages that can handle 10 let alone upwards of 30 HDMI outputs. You would probably be able to run several splitters in parallel, but such a setup would cost several thousands of dollars.
Think I heard the contractor was called RGB. Google search brings up RGB.com
They have a solution that connects up to 56 screens. PC Video Wall with IP Video Wall System Capabilities | RGB Spectrum
Enterprise level always has a solution.