A conveyor belt module for inserting a high-density array of rollers comprises a bottom heavy spine forming a portion of a module body and gusset blocks reinforcing an intersection between the spine and hinge elements. The conveyor belt module includes hinge elements spaced apart by five different separation distances to allow a high-density array of rollers mounted on a hinge rod in spaces formed between the hinge elements and interlaced hinge elements of an adjacent conveyor belt module in a modular plastic conveyor belt formed by a plurality of interlaced conveyor belt modules.