It comes in varity of sizes, they will coordinate with any room size.
We like to see layouts and then help the customer decide what works the best.
The mats you viewed are the most energyminded on the market. The ribbon gives a lower profile than the cable and since it is thicker in width provides a better heat transfer at a lower wattage rate.
The cost is 1/3 less of most other styles of less efficient mats.