Would these tiles be okay on a bathroom floor? I originally picked the onyx for the shower floor and niches (big niche will have three glass shelves and the smaller one will have a shelf with same material as well) but I’m worried about the upkeep. Which do you guys like better? Also how can I make sure the glass shimmers like in the picture (I assume with lighting)? These glass tiles will be installed on the floor and in the niches. Does anything need to be applied to the back of the glass tiles? I have a contractor but I just want to make sure he installs them the best way possible. Thank you! The tile on the floors will be on the walls as well.