I think it's perfectly fine to mix a bit! I'm not a huge fan of big 'in your face' logos, but I think LV monogram is a classic that is almost neutral in my eyes now - and a classic Burberry scarf is also quite 'neutral' in my opinion.
I think I would personally prefer to mix LV mono and Goyard than two monogram bags (because it's a lot of one print), and as someone else mentioned above - I would then avoid adding heavily monogrammed belt / shoes / scarf.
That being said - I'm more of a minimalist and prefer more understated pieces, but there's nothing wrong with going more bold! As long as you love it, that's all that should matter