This is so smart! Wish I knew about this sooner!

Gather Your Materials: You’ll need borax powder, a sheet of wax paper, scissors, and a small spoon or a piece of cardboard to spread the borax.
Cut the Wax Paper: Cut a piece of wax paper large enough to fit the area under your fridge. The exact size will depend on how much space is available, but a 12-inch by 12-inch square is typically sufficient.
Spread the Borax: Sprinkle a thin, even layer of borax across the wax paper. You don’t need much; a tablespoon or two should be enough to cover the surface.
Slide the Wax Paper Under the Fridge: Carefully slide the wax paper under the fridge, ensuring it’s positioned in a place where pests are likely to pass over it. Make sure the borax is spread out evenly and remains on the wax paper.
Monitor and Replace as Needed: Check the wax paper every few weeks to see if it needs replacing. If the borax appears dirty or wet, dispose of the old wax paper and replace it with a fresh one.
Benefits of This Method
Non-Toxic to Humans and Pets: While borax is toxic to insects, it is relatively safe for humans and pets when used properly. Using wax paper helps prevent direct contact with the borax, further minimizing any risk.