Hello my name is Gary, I would like to know what would be the best smoke detector options for my home. I have a two story cape. I've done allot of research but I am frustrated at what i'm finding for battery non wired options. I would ideally like a battery powered interconnected dual sensor alarms for my home. I have not seen that anywhere. So would it be best to have single non connected dual sensor alarms installed? Or would all photoelectric that are interconnected be best? Or ionization interconnected alarms only. What would be best? Hardwire is not an option, this is a 1950's cape currently with single non connected ionization detectors only.