If anything it would be difficult to screw the cbu into the concrete especially with the middle layer of thin set.
How to install tile on a concrete basement floor.
The commercially available mortars generally need to be mixed with a proportional amount of water.
Apply a layer of paint on anti fracture and waterproofing membrane material liquid rubber polymer that goes on like wet paint and dries into a flexible rubber coating on the surface to the top.
Mop the entire floor area of your basement as any dirt or dust is a potential hazard to the success of your tiling job.
Remove dusts and debris with a vacuum cleaner and a broom.
Continue to mix until the texture is creamy.
Once everything is ready start by applying a layer of mortar to the floor.
This is an optional step but can really benefit your tile installation in the long run.
The next step is to apply a concrete sealer on the floor surface.
After mopping allow your concrete.
Most tile professionals agree that attaching a cbu to a concrete floor would be more trouble than it is worth.
Mortar is basically the adhesive that helps the tile stick to the concrete so choose the one that best suits your needs and your current situation.
In short installing cement board between concrete and tile is possible.
It will also provide a stronger adhesion between mortar and concrete.
Add just enough water to get the dry mixture wet and begin mixing.
A concrete sealer prevents moisture from staying underneath the ceramic tiles.
Step 3 plan your layout.
Step 2 cleaning the concrete flooring.