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Most of the thrust is simply to counter the weight of the rocket & fuel. The hold-down clamps only have to withstand a fraction of that.

making something stay on the ground is far less challenging than making something go to space

i think they've got this

SpaceX lists the Falcon Heavy as weighing 3,125,735 lbs (presumably that's the "wet" weight).

So, the hold down clamps 'only' need to deal with ~2,000,000 lbs of thrust. There are 6 clamps, IIRC, so that's 333k lbs each. Seems reasonable.

liftoff

or a cartwheel

Followed by rapid disassembly