Karebear My soap dish and brushholder are somewhat inconveniently located just below the bathroom mirror. My smoke detector is on the ceiling just above the entry door near the stove top. Not sure what the other question is asking? My furnaace/heater is below the refrigerator and the AC is mounted on the roof. I would pesonally go easy on boring holes in either back wall, as the luan inner panel is quite thin for weight savings. There are several good LARGE suction cup hooks which can be used on the smooth surface of the showerstall liner.