Ah, good to know

Well since this is all happening in my basement, I won't have to worry about anything like that
but
any extra safety measures I should be taking while I am using the flexwatt?

Since I will be making my own racks, I am looking for the easiest, and least expensive way to make the rack safe
I have read that lifting the racks up a little so there is air circulation between the flexwatt and the tub can make it a little more safe, increase the life of the tub as well as the tape, how would you suggest lifting it? or maybe there is another way of making the tape safer to use?