An employee take dwelling house for his own use .He paid rent Rs.20000/- PM.
Same rent reimbursed by corporate body company separately, other than regular salary. 
As per sec.2(93 ) of CGST Act company acting  as an principal agent  and it is construed that supply is made to company.
Hence rent paid by employee to landlord , which is reimbursed by co.is liable to pay RCM GST.
Here there is no any contractual agreement between employee and employer for rent.
Is my information is correct