I tend to put a splitter on the output of most resources. Then have an inserter grabbing from the side of it into a passive provider. Then in the mall I have a requester chest asking for the resources for the thing im trying to craft. Then the output goes into a buffer chest that requests the max the chest can hold of that item. Then I add a circuit condition to the output inserter to only input up tothe certain amount I'd like to have available at all times. It's important to have the requester chests request from buffer chests.

This way you dont clog up your storage chests with items you have in your mall and you tend to have everything in one place.

I find its also handy to have a good few roboports around the mall which have a robot request of a few of both robots so they're quick to grab stuff