In my experience the best place for a MW is on the counter. they do not last forever I can bet the next time you will not find one that fits that space.. IMO a 7" size cabinet is useless so as wide as possible on that side and get organizers for inside the drawers instead of sily little useless drawers.

I have a 12" 4-drawer stack to the right of my stove. The top two drawers have utensils for the stove. The third drawer holds DH's collection of spice rubs that aren't in the everyday spice rack. The bottom drawer holds the hand mixer, immersion blender and the thermometer gizmo for the outdoor grill.

I don't have organizers for the utensil drawers. They're too small, and a little jumble doesn't bother me.