T-nuts will work too.

As others have stated there will likely be a problem with wobble. Leveling
feet on the toes would be one solution.

Another way to solve the problem is to use a trangular post rather than a
square one.... A three-legged stool never wobbles. If I were to do that, I
would pitch the legs downward slightly to that the stand always stood on
it's toes; you can still have wobble with 3 legs flat to the ground.

-Steve