mono amp to dual chambered sub box?

You didn't answer what impedance the dual coils are or how many subs, but wiring sub-to-sub can be done on the outside of the box.   Figure out your wiring diagram and connect the voice coils on each sub.  Run each sub to its box terminal and then wire terminals together the same way you would wire subs together.

When paralleling multiple subs by using connecting posts mounted on the box, you would end up with stacked connections.  If your box is a prefab (which I assume it is), the connectors are likely cheap push-in types that may not hold stacked wires well.  A mono amp with dual speaker terminals would allow you to run separate wires from the amp to each side of the box and eliminate stacked wires, and the paralleling will take place on the amp itself.

Or, given that the amp you choose doesn't provide the dual connection feature, avoid stacked wires by soldering a wire-to-wire connection rather than trying to stuff too much wire into a small receptacle.