A floor however stable it might seem will always have imperceptible movement in it especially if there is a lot of traffic over it so i would recommend that you create a cement bed for the mosaic a whole process in itself and best done by an expert and then embed your mosaic into the bed.
How to floor mosaic.
For mosaics that will regularly get wet like shower floors use thinset mortar.
Acrylic based adhesives are easy to use and very strong and good for slippery surfaces like ceramic and glass.
Installing mosaic tiles is a classic and elegant way to finish a bathroom floor.
Such mosaic tiles are real works of art a sign of beauty and emblem of opulence.
This video is an introductio to mosaic.
If you are making an outdoor mosaic make sure your adhesive label states that it is water resistant.
Mark the area you want to tile and hold lay sheets of mosaic tiles to see whether any need to be cut to fit the space.
In certain contexts mosaic tile floors can be palatial luxurious and show stoppingly gorgeous.
However most of us living with mosaic tiles are not so lucky.
Make sure that the wall or floor surface is smooth and flat as this is critical in making sure that the finished job will look great for years to come.