We're currently having the bathroom done and we're having tiled niches above bath and in shower. In my head/Pinterest board it looks like the photo attached but the tiler says this isn't possible with the porcelain tiles we've chosen and we have to have a trim on the outer edge in either white plastic or metal. Do u think I should go for metal (brushed steel) and paint it out or just have the metal edging trim and stop being so fussy???