The Durood-e-Taj is not proved by any hadith, it was invented by anyone centuries after the Prophet (peace be upon him). It is bid?ah and deviation to read this durood. It contains some words of shirk which may affect the beliefs of people. Therefore, it is prohibited to recite it and keep it in shops and houses.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband