There are a few different ways of installing linear shower drains.  It all depends on the type of subfloor you are working with. 

First the location of the drain needs to be determined. Then the drain needs to be set at the appropriate depth so that the finished floor will have enough slope to guide the water toward the drain. 

Once the drain is set and connected to the plumbing system the floor can be sloped and tanked.

Then the floor covering can be installed.