Settlement questions

Hello! A questions about Settlement:
  1. There are a Robot Workbench and a Robot Market structures.
    1a) How exactly it works? Both give Robot Mods.
    1b) What the difference between them?
  2. What does it give - the number of Crafting structures (weapons workbench for example)? It is possible to Draw and Keep 1 Weapon Mod from One structure, so max of them it is 5 Mods?
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