Bathroom Remodeling - Shower

I want to replace a shower head that is directly over our bath. The problem is that it drips every time we use the bath which, as you can imagine is very irritating. Challenge: the fixture end of the bath was only a half-wall (tile); a metal and acrylic ‘extension’ was added to enclose.

I am looking at the shower heads mounted on bars (i believe they are called rail kits), but can’t tell what mounting options we would have. Don’t want to screw.Suggest me the idea to do that.