Create a container (fixed aspect ratio) for the SpriteKit landscape game that can be played on both iPhone and iPad

Question

I want to create a landscape iOS game with SpriteKitthat can be played on both iPhone and iPad. Due to different proportions, I thought it would be useful to have a fixed frame for a real game. I would like to consider this gaming area as a separate container. The rest of the visible area should be filled with the ground where the character is working and the ceiling. Depending on the device, ground and ceiling will be more visible on the iPad and less on the iPhone.

The anchor point for the game as a link for all upcoming nodes should be in the lower left corner of the game area. In the following figure, I tried to draw my thoughts:

Can you tell me what works best and what features are SpriteKitworth a look? I have never worked with scaleModesor anything else like this before.

thank