There are many things to consider when leveling. Some you mentioned. Outside door swing, counters, stove, floor, etc.
You might first need to verify that the floor in the kitchen and the floor in the basement are parallel (both should level at the same time).
I think we all assume most of our appliances are relatively level relative to one another and the floor. But there is always some variations. You should use what is most important to YOU.
We put a RV level on the nose of the 5th wheel king pin box - it can be seen from the drivers seat. We back into our spot, check for side/side level where we want the rig to sit - then block as necessary.
We have a second RV level by the controls for the electric legs. Unhitch and level front to rear.
You will need to assure your source for level in both directions is level when you mount RV levels so they will be accurate.
Bruce A. Wittmeier