I have a Triton TR-20 and use two of the Top Mount Base T-009-H Combos. They work well if you don't want to drill into your boat. I eventually mounted a base at the front of my boat beside the trolling motor pedal as it places the rods further forward for spider rigging. The mount doesn't take up much space and is in a better position.
I now use the Top Mount Bases for the back of the boat.