No. If you have good alignment with the South Celestial pole that should be good enough. I have mine bolted to a steel and aluminium pier on concrete with scribed markings and it seems good enough to bolt down the mount each night.
The apparent pole does wander subtly due to the seeing and atmospheric refraction but it will not affect most amateur users.
If you really want to read about that and how to check with drift alignment see here:
http://canburytech.net/DriftAlign/DriftAlign_1.html