H1B - Inhouse or client project?

Hello everyone. I work for service based company(Tcs,Wipro,Infosys). We are in a proposal phase for a new client in the US and a client interview has been completed for me. The documents like MSA and SOW take time, work location is my employer location. it is around 50 miles from the client location. I will be working for client project from employer location . How can I project myself in the job description? Should I mention Job description that I will be working for an end client from the TCS,wipro,infosys office or should I mention i will be working for inhouse projects .
what are the chances of getting approved or what are the documents needed to avoid RFE and to increase approval rate.