Shower floors: What type of drain system is used to achieve a barrier free entrance?
It is not so much a question of the drain system. Rather one of waterproofing and sloping to assure drainage.
The drain can be a regular shower drain or a linear drain.
When designing or building a barrier free shower, we recommend waterproofing the entire floor of the bathroom (hot mop is great).
When floating for tile, the tile setters need to pay close attention to sloping the floor so that flow lines are positive and all direct water to the drain(s).
Link to post in Houzz: