As a woodworker, I'd suggest to you that putting anything under your tank that can potentially hold moisture in contact with wood products (either solid wood or laminate) is an exceedingly bad idea. That includes towels, carpet remnants or anything else absorbent.
What Dennis (d2mini) pictured and folks that have built boxes lined with pond liners would be OK, so long as no water can get under them. If, however, you have a leak or a tank overflow that allows water get under a tray or pond liner, you will have to disassemble the sump and remove it to allow the wood underneath to dry. Otherwise, there's little doubt that the floor underneath will be ruined.
One thought is to place some 1/4" thick narrow wooden or composite shims underneath a plastic/acrylic tray that holds your sump. If you do have a flood, all you then need to do is mop up any excess liquid, and direct a fan under the sump for a day or so to ensure that any excess moisture dries.