Just simply join your connections together, fix to the underside of the base board, then connect to the next board.
Model Rail Electrics - DC/DCC Track dropper connection board - 50 Pack
Model Rail Electrics - DC/DCC Track dropper connection board - 100 Pack
Model Rail Electrics - DC/DCC Track Dropper Connection Board - 10 Pack
Rare Advertising Deutsche Bahn Track Connection = Direct Connection 1978
PCP-PLUG NCE Powercab Connection Panel (PCP) 2-Way Track Connection Plug
