Using a small hand shovel dig a hole that is at least 2 inch larger around than the cup itself. Because your cups are 6 inches tall you need to make your hole 6 inches in depth. This means cutting through the weed barrier. The cups once placed in the holes should be one quarter inch above the top of the sub base material. Don’t worry if you go deeper because you can always back fill the hole with the loose dirt. Add fast drying concrete mix powder around the entire perimeter of the cup. Use the handle of your hand shovel to pack down the mix. Leave approximately a three quarter inch to a half inch of the cup exposed. Add water to the concrete mix until it is saturated. Next add sub base around the exposed perimeter of the cup. Compact the sub base around each cup using the compacting devise you have chosen to ensure a solid foundation. Run the compactor directly over the cup. This will automatically level and make flush the cup with the surround sub base. Do each hole in the same manor.