I was wondering, how would I bend in the corners with out having this dent in my mesh? trying to model a outside fixture.

I was wondering, how would I bend in the corners with out having this dent in my mesh? trying to model a outside fixture.
Also, in hindsight, start with the LED area
I had a lot of trouble fitting it, and if this was my project i’d start over, cause if you look on the sides, the LED’s dont really fit
thank you so much. I couldn’t get a straight mesh and i’ve been trying for hours.