Hi vannessaisn,
When you use the 6 coins on the gray floor mat, you stick it below the floor mat with the chinese characters facing upward. It should be place at the center of your main door entrance so that everytimes when you step on the floor mat and into the house, the 5 yellow will be controlled and you will not bring the bad Qi into the house.
In my previous post the position of placement of coins run off after submitting. It should be a sword or cross position like this:
---------o
o o o o
---------o
In addition to the above, you can also place a 6 emperor coins tie with a red strand inside and ontop of your main door for double protection.