I disagree with Founder there is a landing distance factor and procedure for direct law. The procedure requires you to land Config 3 Vref +10 and a landing factor of 1.35 dry runway. F/CL DIRECT LAW 3.02.27 P9 and 3.02.80 or QRH.
If you have prior warning of the dual RA fault this is my you should refer to the FCOM 3 after completing ECAM. 3.02.34 P12, this then will refer you to the direct law page and associated procedures and factors. I hope this helps?