How high do you want it? It would be fairly easy to build a small riser for it out of 2x4's and plywood. If you are just concerned about having the heat tape on the carpet, you can buy a 2"x4'x8' sheet of rigid insulation that is foil backed on one side and cut it to the same dimension of the T-25. They run about $30 at Home Depot.

http://m.homedepot.com/p/Thermasheat...3010/100573703