I work in Maya in Feet scale, however I set my preferences back to centimeters before exporting as FBX because otherwise the scale comes in completely wrong (gigantic or tiny i can’t remember which).
You don’t have to scale it though in Maya if you just work in feet, (I generally keep my grid divided into inches).
Test your work. Model some test objects, like a simple character, a chair, a table, a door. Bring these in separately into UE4 and make sure the scales work with the first person or third person setup in UE4. Adjust the scale of your model if you need to, and you can do this in UE4 but just scaling your models then exporting them as fbx files back to Maya. Then you can adjust your scale in Maya and keep these default items around as scale reference to use in various files you use to make sure you are building to scale.
This doesn’t mean you shouldn’t build according to the inches and centimeters, but it gives a good visual reference to make sure everything is always on track and you haven’t slipped into a different scale on either end.