I have seen pictures of them being used on wooden carts all over Asia, but, more often, they are places on the ground and used. I suspect this is more for stability than fire prevention. The Japanese version is designed for use on wooden tables. The ceramic bottom is more than adequate for shielding the heat.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."