Michigan Smoke and Radon Detectors Advice Needed.

[Christine Seeley]

I'm a Michigan landlord who resides in a two-story, side-by-side duplex (3-bed each) and has the other side rented. It's been a long time since I've been very active in the RE world. If I understand the laws correctly, I need to add smoke alarms to each bedroom. As of now, I have only one smoke alarm on the main floor and one in the hall of the 2nd story (in each unit). I also have a basement that runs the length of both units and it has been recommended to me to have a detector in the basements, too. 

So, my first question is, does this mean I need 6 alarms in each unit? (3 in each bedroom, 1 in the upstairs hallway, one on the main floor, and one in the basement).

My next question is, what type do I want to get? I'm on a really low budget but want to be up to code. And where might I find a good deal? Amazon?

And one more question. From what I understand in the current laws, I need a radon detector for the other unit (have one already in mine). Is it a good idea to have a combo smoke/radon detector?

I'm hoping to be renting out my side of the duplex next year, and am also looking to bring things up to code for Section 8.

Thanks, anyone and everyone for any helpful advice you might have.