When placing your tubes in the microcentrifuge, If your research supervisor doesn’t have a preference, then always place the tubes hinge up. If you develop this habit, it might serve you well--depending on the type of research you do.
For example, if you have a pellet after the spin, you’ll always know that it will be opposite the hinge*. If instead of a pellet, you have a streak of material on the side of the tube, you'll know which side to avoid when pipetting off excess liquid.