If you want to install a shower over a concrete floor a fiberglass shower stall will work just fine.
Installing shower waste in concrete floor.
How to install a shower drain in the concrete floor.
Set the shower base in place to double check the final placement of the p trap inserting a short temporary tailpiece.
Ideally you ll already have a drain roughed in with the pipe sticking a few inches above the floor.
Ensure that the marks drawn on the on the studs align with the top of the tile flange.
While placing the shower base into position ensure that the drain assembly slides over the pvc waste paper.
If you are installing your shower tray over a solid concrete floor then you may be best going with a raised tray as this will avoid having to chop down in to the concrete to allow space for the waste.
The most efficient and least expensive method of installing a basement shower without the need to break concrete is to install it over existing plumbing stub outs.
When you set the shower base permanently measure and cut a permanent tailpiece and cement it into place.
Drain with the p trap located under the concrete slab.
You will also need tools to fit the shower drain on the concrete floor and a whole bunch of pipes and fittings.
This should apply to the front edge contacting the rough floor along the length of the shower base.
In general if you are installing on to a floating timber floor a flat low profile tray is the way to go as the flat base will provide great support for the tray and also access to the underside of the tray for the waste should be fairly straight forward as you can simply cut a hole in the floor.
The first step is to decide on the schematics of the shower base and ordering it.
This limits your ability to change the basement layout but if the stub outs are in place using them will save money and labor.