There are 24 holes that are fitted for a 12mm diameter connector.

To utilize any of the holes, you'll first remove the back cover, then remove your desired locations punch out

After that you'll need to remove the nut of the GX-12 Connector, and thread the connector from the outside and the wires in.

Use the nut to tighten it down from the inside. Then route the wires into the slot. 

Pro tip: If routing multiple wires at the same time, group and label them meaningfully just so long as you know what they are. 

After routing them through the hole, you'll pull them into the masso touch unit, and plug them into the appropriate ports.

Pro Tip: It would be wise to have a methodical approach and a labeling system of some kind from the beginning for when you need to disconnect your cables which is inevitable.