Hidden red flags in Greater Noida's 'High Rental Yield' corridor

What are the real hidden risks when looking at properties in Greater Noida's 'High Rental Yield' corridor? I'm based in Dubai and can't visit, so I'm worried about legal clarity and finding a reliable property manager. Is the rental demand as consistent as it seems, or are there long vacancy periods? Any red flags with specific sectors or builders one should know before committing?