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You need a level surface so you would want the joints to be done & dry. HOWEVER you really shouldn't put tile over drywall. Cement board, HardiBacker or green board, but never drywall.
The degree of freedom (DOF) of a robotic arm can be computed based on the number of the joints and types of the joints. For most robotic arm, the joint is either prismatic or revolute(about one axis), the DOF is simply the total number of the joints.
hip joint
To prevent sidewalks from cracking in random spots and breaking apart, builders make lines in sidewalks. The technical term for sidewalk lines is contraction joints. Contraction joints are placed in fresh concrete before the concrete dries and has a chance to create its own joints, which we call cracks.
Number of planes in the uniaxial joints?