Need help with a classroom LCD mounting / wiring setup

[PeterB]

Ken, yeah, I'm looking at Monoprice but am not sure if I'm looking at the right thing.

Examples:

http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10828&cs_id=1082801&p_id=5465&seq=1&format=2

http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10828&cs_id=1082802&p_id=4051&seq=1&format=2

http://www.monoprice.com/products/product.asp?c_id=108&cp_id=10828&cs_id=1082801&p_id=3007&seq=1&format=2

... I'd definitely want tilting capability, but am unsure about how these things attach at the ceiling point, and also what the advantages/disadvantages are of each...