The apparatus described herein may include a base plate, one or more walls, one or more obscured feature detectors, one or more obscured feature indicators, a controller, and a power source. The base plate may include one or more surface-mounting structures that mount the apparatus to a surface. The walls may extend at least partially perpendicularly from the base, and may include one or more device-mount structures that mount one or more removable devices to the walls. The detectors and indicators may be connected to the base, the walls, or both. Each detector may correspond to at least one of the surface-mounting structures. Each indicator may correspond to at least one of the detectors. The controller may be electrically connected to the detectors and the indicators. The controller may activate the indicators as the detectors detect a feature obscured behind a surface adjacent to the detectors.