Otzi Spark Fire Mat
Don't even buy the Spark grill without this thing - your options go out the window. With this mat (it should be included at no cost, IMHO), you can place the Spark on a table or countertop without burning things that are not to be burned. Without it? Suboptimal - ash and sparks are likely to ruin whatever is underneath, which may not be sand.
We used our grill on our first camping trip…it was awesome. We used it for heating water for coffee and and heating food. Would definitely recommend it!