Best position of Rahu in various lagans
As Rahu and Ketu both possess different significations and results accordingly. If Rahu is known for the desires, attachment, worldly pleasures, hunger then, Ketu is known for the detachment, renunciation, spirituality or spiritual process of evolution, sadhna, other worldly interests, derangement, wisdom, fantasy,
Both works in different direction because Rahu is head (Brain) and Ketu is a headless body having only heart.
Similarly Rahu inclines native to fulfill the requirements which are cropped due to mind and it’s desires but Ketu works on the path of heart feelings which are truly for the spirituality. On the other hand Rahu also works mysteriously during its Mahadasha phase.
Similarly for Rahu, signs which are productive signs like, Taurus, Gemini, Libra are the most comfortable signs in these signs Rahu results good.
For Ketu, Scorpio, Sagittarius, and Prices are the best signs and Ketu feels comfortable to gives it’s utmost results.
If Rahu or Ketu is posited in the 3, 6, 10, 11 houses (upachaya houses) or favorable rashis are calling in the Upachaya houses then good results can be expected.
I hope this answers your concern.