What is the correct orientation of a domestic Shiv Lingam? Where the Yoni should face? Any position is formally allowed or should be positioned for example facing North or South? In this case , can someone document the answer with references?
From the Kamika agama purva pada part one, chapter 4 discusses one of these aspects
Verse 17: The west facing linga is considered to be superior. If it is not available, east facing linga may be used for worship. The north facing and south facing lingas are not preferred by Sages for worship.
Chapter 64 is about the installation of Lord Shiva linga in detail. Here the verse 28 clearly states
One should place the shiva linga along with the pedestal carefully with the head portion lying in the east.
In India, the yoni should be facing North. Also, this can depend on many situations like the region of India. One example is that in Rameswaram, the Lingam is facing north, according to this website. Also the lingam in Ekambareshwarar faces North. I have checked the directions and everything, and can say with certainity that the lingam faces North.