This is a nice housing for the regular $3 thermometer that you can find on eBay. It can be screwed to the top of your Ikea Lack table or any other table. Here there are two types... a 15 degree angle and a 45 degree angle. The pictures show the 45 degree angle.
The best angle for highest LCD contrast depends on how tall you are and your setup. I've found that at 45 degrees it works really well on top of a three-tier Ikea Lack table.
Under the housing, you can roll up the excess temperature sensor cable. Just drill a hole in the Lack board and let the sensor hang down about an inch. Attach the housing to the top with two screws from your screw assembly.