Many similar products out there...AVOID Genesis G Mat
Schluter Ditra is the original, Dural is in my opinion as good and a fraction of the price.
Basically you would need to prime floor as usual ( special prep for anhydrite screeds )
Use a 4mm square notch trowel and trowel floor with a cement based flexible adhesive, roll out mat gradually, pressing down and smoothing out with a grout float, mat can be walked on more or less straight away.
When fixing tiles first use flat edge of trowel and fill in all holes, then serrate as usual.
If you PM me I would be happy to advise where to buy at virtually the lowest price in the UK