Hi @SAMDAR
As far as I understood your initial post, your goal was/is to update one instance
from Checkmk 1.6.x to 2.0.x. Your last post is referring to a distributed monitoring setup,
so you need to update multiple instances.
As per the update guide, the recommended procedure to do this, is to stop all instances,
update all of them, and start them all up again: That’s all you need to take care of.
Checkmk, and updates for it, are - more or less - independent of your underlying OS, resp.
your infrastructure combinations. As such, I’m hesitant to give you a recommendation for
your “example” plan, but it does sound feasible… 
HTH,
Thomas