Remove the nail and squeeze a drop of adhesive on the base of the molding transition to attach the tile. One long grain, narrow is enough to maintain the molding in place. Set the molding in which you want it attaches, press down to seat the adhesive and hold the piece down for a few minutes.
As materials, porcelain tile goes with changes in humidity and temperature. If the motherboard is attached to tiles, it would steer away from the wall as the porcelain shrank, leaving a space between the molding and wall. Transition moldings, but do not adhere to the tiles. Transition molding covers the difference and save the difference between two different land types, such as tile and hardwood.
Insert a tube of construction adhesive or silicone caulk to a caulk gun. Tilt the cut at an angle of 45 degrees and make the hole is about 3/16 inch diameter to create the correct bead size. The pit does not have to be exactly 3/16, just somewhere around that diameter wood porcelain tile. Add a long nail in the pit and through protective foil seal on the nozzle base.