The inches of the screen is kinda’ irrelevant.
What are the Pixel dimensions of the comp you need to make?
I once had to make an absolutely huge animation for Nesquik to play on some weird sized screen in Times Square. And I was dealing with this same kind of thing.
Here’s my suggestion.
Make the animation in one master comp. (all six screens)
Then place that master comp in 6 different compositions, one for each screen.
Then simply work out the math so that you move it on the X axis the proper amount, to make each of the 6 comps render out the portion of your master comp appropriate to that screen.
Make sense?
My Work:
https://www.morecompletefx.com