Vastu for Pooja Room
North east corner of a structure is always desirable for the performance of a pooja, but never a mandir should be constructed in the north east corner. Even a nail should not be there.
Pooja room could be built anywhere in a structure. It should be somewhere in a corner of a kitchen or a hall. Here too take the guidance of a good vastu consultant for Vastu for Pooja Room. Facing should be east or west but not otherwise.
Even for properties with deviated axis of north-south east or west but not the corners.