are you sold on a precast shower pan? A custom pan can be made with a linear drain or tile insert drain that you can barely see.

yes, for maintenance and cost point of view, we are choosing precast pan for this bath. we will do a tiled bath for master.

any suggestions?

I am pretty sure you can drill into terrazzo.

I called Florestone and Fiat. Both said they will not provide any warranty if it's drilled and it might crack. For practical matter, it might be ok but don't want to risk it