… this is probably the most common type of telescope pier head / mount coupling, and is to be avoided.
Truth is, the base of the mount does not need to be perfectly level – what we’re looking for is a perfect alignment of the RA axis with the pole.
If the base of the mount is slightly tilted, that’s not a problem!

A heavy tilt may cause problems, though, as in the leaning tower of Pisa 🙂
These fine-tuning leveling contraptions result in less rigid, more complex piers, no real benefit, and also, usually, in a waste of time trying to achieve perfect level. No need!