Some boats don't need them. So, take your boat out and try it. If the boat lists to one side or the other, you might need to move the weight around the boat (1st). If you have problems getting up on plane, or the boat porpoises, then tabs can help.
Bennett have been around for a very long time. Some of their models have fins on the tabs, which help keep the boat straight when trolling . Like any hydraulic system, you will need space in the boat for the pump/reservoir.