Not sure I understand what configuration is. A picture would be helpful.

There are only three factors I am aware of that need to be considered.

Stair code: As long as "step" from door is at least 11" deep and not more than 8" high, rest does not apply and it is not an issue.

drainage needs: Entry to house should be sufficiently raised that during the most severe rain storms, water does not flow into house. If porch flooring is solid ( no gaps for water as in a deck), this is of particular concern as a combination of heavy rain and wind blowing water toward the house could cause water to flow under the door. (Height that matters is not top of sill, but under sill to flow over flashing under door frame.) If, as your description sounds, door is below height of deck, then reducing basin that can catch water a plus.

door opening landing code requirement: If door (or screen door) opens outward onto space, need a landing for person outside to stand on while opening door. If door opens outward, depth of landing must be at least 36".