Due to a leak I need to put in a new floor and I want to put in peel and stick tile. What do I need to put under the tile to keep it from separating as the floor shifts due to our black clay. I had cement board, floor leveler, and backer board recommended but I'm not sure which is best or how to start. I will be doing this myself with help of one person. Thank you for any recommendations and suggestions you have. Gennilou