Yes you can use a magic eye, BUT beware that you ensure that the box has adequate ventilation - overheating is the biggest killer of digiboxes and Sky digiboxes output quite a bit of heat and cutting back on noise can very often lead to cutting back on ventilation.
Yes, you can use a magic eye to control a hidden box, no problem. Be careful, these boxes need cool air. Two fans inside are active, and as the unit temperature increases, so the performance can decrease. Be careful what you wish for.