When our guild has work shops, we set up groups of 4 rectangle tables: 2 tables face the other 2 tables. Up the center of the 4 tables is a heavy duty power cord and a surge protector strip. The power cord does come from a wall far away as we are in a gym so we tape the cords down where possible. An announcement is made before class to please look down when you walk to be mindful of the cords.