A rack setup question about keeping a motherboard tray flat or raised

The practical question is whether a platform inside a rack can sit flat against the bottom, or whether it should be lifted on risers. The risers shown in the second picture are not a final size or design.

They are only a quick example meant to show the idea. No specific rack size, model, path, or material details are provided.

Key points

  • The setup compares a platform sitting flat in a rack with a platform raised on risers.
  • The riser shape shown is only an illustration.
  • The final riser size and design have not been chosen.
  • No detailed or installation conditions are included.
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