Allow filtering by location when looking for a "free item in a specific period" (reservation tool)

In a multi-site but single entity scenario It would be useful if the  "Find a free item in a specific period" reservation tool allowed users to limit search to a given location.

Example use case: An user located at Paris wants a room for a meeting: it does not want GLPI to offer him rooms available in Grenoble or Bordeaux.

A simple "Location" dropdown with "is/is not/under/not under" operator would suffice.

And it could also be prefilled with user's location.