There are two main types of anti-fracture methods that we use.
Anti fracture matting is a flexible sheet on a roll which is stuck down with tile adhesive and ran over with a weighted roller to ensure full contact.
Tile backer boards cone in a variety of different types we don't use ply only cement boards and thermal boards they are stuck with tile adhesive, screwed with galvanized washers, anti rust screws and anti crack tape then staggered opposite way to floor supports.