Have the pipes come down the wall behind the radiator at worst you will see the pipes above the radiator and where they enter the valves at the bottom.. Better still use plastic minibore piping sunk into the plaster behind the radiator splaying it out from a wall adaptor plate near the base of the radiator into the two valves. My daughter has this arrangement for all her radiators and you barely see the pipes at the valves. One benefit of this arrangement is that the air release point is where it should be at the top of the radiator.

Richard