Yes it's possible, I have 2 charge controllers on my home batteries.
One is simple, just solar input, dumps power at a user set level which I set just below the smart controllers float voltage to prevent latching & ultimately prevent the smart controller disconnecting due to it's perceived over voltage.
The smart controller has the micro hydro + solar input & does the automated regular float, boost, equalise & absorption cycles.
That's an issue you will have to deal with if you have multiple smart controllers, as they can get cranky if one is trying to do an equalise charge & the other wants to be at float voltage.
I have also had mains charging hooked up at the same time in parallel, but I turn it off before it gets a high enough voltage to effect the smart controller.
IIRC there are some smart controllers that are designed to talk & work with each other. The Midnight charge controller/regulator comes to mind.
My neighbour runs 2 side by side on his large solar array to battery setup.
Yep it says "Internally parallel-able. No extra hub required"
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