The magnetic meridian should pass through the centre of the plot. While planning the structure, care should be taken that it is parallel to the wall compound. The passing of the magnetic axis through the middle of the plot is good. If the structure is not parallel to the compound wall, it creates difficulties. Therefore, every structure should be parallel to the compound wall.
How one should build scientifically his building structure is vividly given here. Details about various kind of plots viz. Gomukhi Plot, Vyagramukhi Plot, L type plots.