Fire Tablets that will work with Pro

Hi All,

I ordered a 12 zone pro conversion kit on Black Friday week.  Still not shipping but that's OK.  In preparing ahead of time I was looking at Fire Tablets and the variety of them available.  I will be replacing two old-style keypads.  I even have an early one (don't know which...gotta find it somewhere,) My question is which ones work best with the system.  I see the latest and most have a choice of 32 or 64 GB ram and ads or no ads.  So what makes the most sense from your experiences.?  I don't want an expensive piece of hardware sitting on the wall running at only a small percent of capacity but I do want it to adequately run well when I need it with a good response.  What about software I will need?  Any purchases or subscriptions needed that aren't mentioned previously?  So what do you all think and why?

Fire Tablet Model ....

32 or 64 GB....

Any tips, suggestions on install?....

Can it be used in other ways while there?...

Software needed to run it?....

Thanks in advance. I know it's a lot to ask but I have a feeling your responses will be utilized mny times over in future installs for many others.

Have a great Holiday Season 2020 everybody!!