There are a few methods to secure the cable to the floor until it is embedded:
Use a small amount of tape to hold the cable tot he floor. (do not cover ALL of the cable, just use small perpendicular strips to secure it)
Hot glue is acceptable, provided that the tip of the glue gun DOES NOT touch the heating element. Do a small drop on the floor and press the heating cable into the drop.
The mat comes with a tape on one side of the mat to aid in securing it to the floor.
Staples may be used on the mesh portion of the mat. (DO NOT STAPLE THE RED HEATING CABLE)