[bojan]

Levelling of the pier is not so important because the mount itself has all provisions for alignment (N-S. Up-Down screws).
The frequencies are different matter altogether.. but also not very important - the important bit is damping of oscillations of any frequency at which the whole setup may oscillate, when bumped (accidentally or intentionally), and their amplitude.
Usually, the more massive and sturdier the pier, the smaller the amplitude and the higher that frequency is (because then only mount itself and the load (telescope + accessories) are the factors), and the duration of oscillation is shorter - a very desirable situation.