What precautions should be taken for a TV stand (heat, cables)?

Leave some ventilation around the devices (amplifier, box, console) to dissipate the heat. Use the provided cable passes; if you need to create a new opening, make a clean cut (hole saw), centered and of small diameter, without touching the studs. Avoid completely enclosing the electronics, group the power supplies and cables so as not to obstruct the closing of doors/drawers.