best way to secure metal strip between tiles and wooden floor?
That looks like a snap in style once they pull out a few times the Chanel may need to be squeezed together if the raised section on the back of the trim is still in tact. If the raised section has broken off 3 small flat head screws can be added by predrilling and counter sinking the holes (predrill in place to punch a hole in the channel ). This would be how I would repair it to stay in place.