Except as provided in subsections (b) and (c) of this section, there must be a carbon monoxide alarm installed in a central location outside of each sleeping area within a dwelling subject to this subtitle. For a hotel or a lodging or rooming house, on or after April 1, 2017, there must be a carbon monoxide alarm installed within the dwelling, as follows: on the wall inside each guest room that: contains a device that emits carbon monoxide; is adjacent to a room or area that contains a device that emits carbon monoxide; is adjacent to an enclosed unventilated attached garage; or is connected by ductwork to an enclosed unventilated attached garage or room or area that contains a device that emits carbon monoxide; and on a wall in each room or area that: contains a device that emits carbon monoxide; is adjacent to a room or area that contains a device that emits carbon monoxide; or is adjacent to an enclosed unventilated attached garage. For a rental dwelling unit, on or after April 1, 2018, there must be a carbon monoxide alarm installed within the dwelling as follows: outside and in the immediate vicinity of each separate sleeping area; and on every level of the unit, including the basement. Notwithstanding subsections (a), (b), and (c) of this section, if there is a centralized alarm system that is capable of emitting a distinct and audible sound to warn all occupants, the owner of a dwelling may install a carbon monoxide alarm within 25 feet of any carbon monoxide–producing fixture and equipment.