Basic Setup Questions

Hi all,

I ordered a smart puck and three vents for my bedroom as a "trial run", and I'm impressed, so I've decided to implement flair in the primary three living areas in my house.

We have had major problems with my partner's bedroom, my bedroom, and downstairs. This is a small condo without "zones" and when it's really hot out, it becomes unbearable upstairs unless we turn the lower floor into a meat locker.  Etc.

We have ecobee, which keeps insisting we use ecobee+.  I think I've finally managed to turn that off for good, as it was just exacerbating the situation.

So, downstairs we have a living room/dining room/kitchen open area, and upstairs are two bedrooms.  We want to maintain separate temperatures for each area, although they would be within striking distance of each other.  But, for example, my partner prefers it on the warmer side while I prefer the cooler side, so I'm hoping he could set his bedroom to 75, I could set my bedroom to 70, and the living area we could keep around 72 or 74 or ... whatever.  We spend a lot of time upstairs except when cooking and eating.

Any tips?  The rest of the flair equipment I ordered (for his bedroom and the downstairs area) is coming next week.  Do I need to do anything special?  Also, I prefer the flair's temperature adjustments to ecobee's.  Can I just turn off the ecobee sensor?  I don't see the point of it, as the flair sensor seems better and isn't constantly telling me my room is unoccopied.  And we don't even have a sensor for my partner's bedroom anyway.  I guess what I'm saying is, I'd like to turn the ecobee into a mainly dumb thermostat, other than that it can be controlled remotely via flair.  

Am I thinking about this the right way?  I know I can experiment and probably get this figured out and working the way I want, but hoping to avoid any gotchas.  Thanks!