When I was living in France I had an Anglophone-Canadian friend tell a non-Parisian that he wanted to develop a Parisian accent so his French would sound good. The French person told him that Parisian accents were hideous and he’d be much better off learning to speak French with an accent from some other part of France - even if it weren’t the part we were living in.
In later months I heard this opinion echoed by other French natives. I was fine personally with speaking American-accented French, as long as I was able to make myself understood. (I used to be able to turn on a really strong French accent - and some people said I should talk like that all of the time, but it made me feel like Pepé Le Pew.)
