Sticking Suction Cups to (some) Non-Smooth Surfaces

Step 3 Select a Tape

You need a tape that is at least as wide as your suction cup. You might be able to get away with tape only a slight bit narrower, but your mileage may vary on that.

Here I'm using standard-issue packing tape; it's about as wide as this suction cup.

Note: unfortunately you can't overlap pieces of tape for larger suction cups. You will need to get bigger tape, or smaller suction cups... the seam in the overlapping pieces of tape (or tha gap if you try to put them side-by-side) allows air in and you won't get good suction.