We have no alters, but I personally like to preserve a special prayer in the house only for prayers. In my view, in this way, that place is filled with the positive energy of praying, and I will only use it with clean clothes and clean mind.
Then there is the statement "In the Privacy of his chamber", which is interesting;
"Intone, O My servant, the verses of God that have been received by thee, as intoned by them who have drawn nigh unto Him, that the sweetness of thy melody may kindle thine own soul, and attract the hearts of all men. Whoso reciteth, in the privacy of his chamber, the verses revealed by God, the scattering angels of the Almighty shall scatter abroad the fragrance of the words uttered by his mouth, and shall cause the heart of every righteous man to throb. Though he may, at first, remain unaware of its effect, yet the virtue of the grace vouchsafed unto him must needs sooner or later exercise its influence upon his soul. Thus have the mysteries of the Revelation of God been decreed by virtue of the Will of Him Who is the Source of power and wisdom."