Just use wires. It is like hooking up any other TV that is not on the wall. You can let them hang down and have a very unprofessional look or you can buy wires that are rated to go in the wall (make sure they are to avoid any code violations or insurance issues later) and then it will look more professional. Either way, you cannot run the power cord through the wall by law. Your best bet is, depending on the type of surround sound receiver you have, is to run all the wires into that and then 1 wire out to the TV.
Just use wires. It is like hooking up any other TV that is not on the wall. You can let them hang down and have a very unprofessional look or you can buy wires that are rated to go in the wall (make sure they are to avoid any code violations or insurance issues later) and then it will look more professional. Either way, you cannot run the power cord through the wall by law. Your best bet is, depending on the type of surround sound receiver you have, is to run all the wires into that and then 1 wire out to the TV.