What works for my application is "HardieBacker Wet Area 3 ft. x 5 ft. x 0.42 in. Cement Backerboard". It is light gray and does not flex like a thin sheet of aluminum. About $17 USD from a home improvement store. Slightly higher in Canada.
If you are not using one already, place a 6 x 9 inch aluminum cake pan at the end of the torch on the table. That will catch anything dropped and prevents marbles from rolling off the table. And for the same reason, some place a raised edge around the table top to prevent items from rolling on to the floor.
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