Usually the north eastern side of the house is considered a place
of energy flow due to the ambient sunlight entering the house.
Depending upon the size of your space available , either for a room or a cabinet the pooja space is usually designed as per Vastu Shastra in terms of zoning the space i.e., East/West.
Placement of the idols should be 18” above the finished floor level.
As the idols are to be placed 18” above,the bottom space can be utilized as drawer storage to organize the books or Pooja essentials.