Somewhere ventilated that you can reach later: an adjoining cupboard, the space above the wall cabinets, or behind a removable plinth panel. Drivers make heat, so never seal one in a closed void, and keep it away from the oven, dishwasher and rangehood. A plug in driver needs a power point inside the cabinetry. Any hard wiring, new power point or wall switch must be done by a qualified electrician.