In my understanding of the way solar panels work, and how MPPT solar charge controllers work, you basically cannot connect one, or one set, of solar panels to two MPPT charge controllers. The reason for this is because solar panels do not work like a battery, where there is a relatively fixed voltage output, and you can parallel them to pull more current. Solar panels vary in both voltage and current depending on the amount and angle of sunlight hitting the panel, and to a lesser degree on the temperature of the panel (colder being better). Also, the voltage varies with the amount of current being drawn from the panel, as the current is increased, the output voltage decreases. So, a MPPT charge controller is going to determine what the panels’ instantaneous maximum power is by regulating the current being pulled from the panel and seeing how the voltage changes, and then determine what is the maximum power that can be taken. And it does this very quickly and continuously. So putting two such MPPT controllers, trying to do that same thing simultaneously on a common set of panels doesn’t work because they will interfere with each other’s operation.
Having said that, I am certainly no expert in all the technical aspects of solar panels and MPPT charge controllers, but this is based on what I do know.