Although metal edging is typically used with metal tiles it can also be used with ceramic tile.
How to install ceramic tile metal edging.
How to install schluter metal edging for tile.
On the other hand if you have to install an aluminum floor tile edging the procedure is a little more complicated as you should secure it with a couple of screws.
A tile trim is easy to install protects the edges of your niche and completes the look.
The substrate is hard and rigid so there is no need to use concrete backer board.
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Flexbond will work well in either situation.
If the metal is horizontal or vertical use flexbond fortified thin set mortar as an adhesive.
Therefore if you have to install a metal tile edging on a wall inside or outside corner you have to spread the adhesive first and then secure the trim.
Therefore if you have to install a metal tile edging on a wall inside or outside corner you have to spread the adhesive first and then secure the trim.
This step by step article is about installing tile edging.