Some do, some do not. It’s not about which ones can build a flat surface; it’s more complicated than that.
For example Bluco, probably the highest-end table maker on the planet, gives no flatness guarantee – though they are probably the flattest you can get. That’s because a table could leave their facility perfectly flat, but after being strapped to a pallet, forklifted around, and placed on an uneven floor, it might not measure as flat any more.
However, if you mount any professionally manufactured table to the floor and use the leveling feet provided, you should be able to get the table exceptionally flat.
Siegmund and StrongHand both offer roughly the same guarantee, which amounts to basically no “dips” or “humps” greater than 0.0025″ within any given 1-foot section.
