You can just put the controllers on the same bank directly if convenient each with its own pos wire fuse sized to the current on each, close to the battery bank. Or if you want,
you can do the same thing by running a wire pair from the bank posts to extend them to some convenient point and parallel the controllers onto the end of that pair. You would fuse the pos wire of that with a bigger amp fuse because it will carry the total amps
Since the rule is to disconnect the array before the battery is disconnected from the controller, and to connect the battery to controller before connecting the array to the controller, I like to have a convenient switch on one of the two wires between controller and array. In this case you would have one switch for each set
