Correct formation of REST endpoints?

Question

RESTful API

There are 3 resources:
1. Category - Category
2. Device - Belongs to category
3. Article - Belongs to device

How to properly organize EndPoints for Device, Article?
Nested

• GET categories/:slug/devices
  
• POST categories/:slug/devices
  
• PUT categories/:slug/devices/:slugDevice
  

Or flat:

• GET /categories/:slug/devices
  
• GET /devices/?categoryId=1 (Alias ​​for item above)
  
• POST /devices (categoryId passed in body)
  
• PUT /devices/:slug
  

Are there any standards or amenities from one of the options?
I like the second option better because it's flat and easier to work with

Answer 1

If slugDevice is unique only within a category, then you will have to do "nested". Another minus of "nested" ones, in addition to your own identifier, you also need to know the nesting identifier, and what to do when it has changed, for example, moved to another category?
So I'm always for "flat", except when you need additional data for identification.