don't tile the floors for about a year. let any cracks appear then use the decoupling matting over the cracks, i left my floors 2 years and two years after tiling no cracks have appeared{40mm poured screed and ufh} i would recommend using slow set adhesive as well as it gives you time plus it sticks better than fast set. and as above tls and 10-12mm trowel and back butter the tiles as well.