smoke and carbon monoxide detectors

My coach came with the carbon monoxide detector in the bed room and the smoke detector in front and above the passenger seat. Smoke still goes off from time to time from the toaster but all in all I think this is the correct placemrnt. The carbon detector in the bedroom also makes sense to me because that's where most people do not wake up from if it is present. That's where and how I would put separate detectors.