How to prevent chocolate covered items from sticking to the cooling rack?
The simple approach is to skip the wire rack and place the dipped confections on parchment paper, waxed paper or a silicone mat. (Some use plastic wrap or aluminum foil, but this may stick as well. Oiling helps.) After cooling, they should come off easily. However, there’s a chance of them developing “feet” when the runoff pools on the parchment, especially if the coating is on the runnier side.

If you use a rack (which reduces the “feet” by letting the excess chocolate drip down), you should lift the creams up once they have mostly, but not fully, solidified and transfer them either to the above mentioned parchment or a clean spot on the rack. You can also oil the rack very lightly, but the effect is not too much.

In any case, make sure you let all excess chocolate drip off well before actually placing the creams on whatever you choose for the cooling phase.