"ap" wrote...
Hello,
After shopping around much, purchased a nighthawk digital for $33 from
wal-mart.
These are expensive and I'm wondering if the best placement would
be high in the hallway near the bedrooms. There are 3 bedrooms that are
occupied.

Put it in your own bedroom, so you can hear it if it goes off. The
exception may be if the layout of your house suggests that potential CO
sources are significantly closer to the other bedrooms.

$33 isn't a lot of money if it saves your (or your kid's) life. If the
bedroom doors are closed at night, put one behind each closed door.