I've just moved into a new house and it doesn't have a smoke alarm on the main floor yet. The main floor is a long rectangular open concept design, with living room at the front near the front door, kitchen at rear with rear door, and dining in between. About 37 feet long, and 12 feet wide for the most of the length. I'm trying to figure out a good number of fire alarms and where to place it/them.
Here is a rough sketch, side and top view, not to scale:
Those stairs go up to the second floor and have an alarm at the top already, i.e. in the upper hallway. I see three candidate locations: A,B, and C. Based on what I've read online, it seems alarms are not recommended right in the kitchen area (too many false alarms?), so I'm leaning away from A. I'm seeing recommendations to have an alarm in both the dining and living room, but in my case those are one continuous space. So I'm wondering should I do B (middle of the house length-wise), C (front of the house, further from kitchen, or both? Or all three?!?
Note that there's a bulk-head with some duct work that segments the ceiling of the kitchen from the rest of the floor. It spans the width of the main floor.
Thanks in advance.