The shoe will open up slightly after break-in. This happens in all shoes but is more noticeable in some.
If you feel like your feet are going to be sliding around excessively in them, then they are too wide. You can try using a thicker sock (like a Thorlo Level 3) or going with 2 pairs of regular socks. I have narrow feet so double bag with 2 pairs most of the time. Wearing 2 pairs of socks is also a great form of blister protection as the outer sock can move around on the inner sock and not rub the skin at all.
Hope this helps.