Hi Patrick,
Some constructors provide a more details stencils ( where you can pin-point to the exact port), example here on a neatgear switch :

Most of them are available on this github repo btw: https://github.com/girlpunk/VisioStencils
Some constructors provide a more details stencils ( where you can pin-point to the exact port), example here on a neatgear switch :
Most of them are available on this github repo btw: https://github.com/girlpunk/VisioStencils