Min-Max at ORG Level with Multiple Sub Inventories in different cities in a single ORG

We have a scenario where we will have 7 different cities, each city created as a sub inventory within one Inventory ORG. We plan to use cost group (Average Costing) to have unique valuation account for each sub inventory. This is for EAM Org and not for Production Org. Appreciate any insights into potential pitfall of this design and key issues that I may be missing (like Min-Max, Ordering non catalog parts, delivery locations etc). Plan to run Min-max at the ORG level (Must for EAM)  Thanks