Modelling a computer monitor - need some topology advice on using edge loops for sharpening I'm modelling a computer monitor (as a learning exercise after completing Blender Guru's "Donut" and "Anvil" tutorials) and need some advice on how to use edge loops the right way for sharpening some details. Please let me explain my problem with a few screenshots, see below.

The last screenshot shows the problem, the three edge loops over the corner surface causes problem when applying subsurface modifier. 

I really like to learn the best way of working with topology, maybe someone can guide me in the right direction on how to model my example in a better way? My blend file is attached at the end.

Overview of model (using Mirror modifier):


Detail on my edge loops  for sharpening the corners:


Artifact visible using Matcap shading:


Blend file:
Here's one possible solution. Model with quads for your front faces (Don't have an edge on the corner).