Salah is certainly a respectable player, but I don't think Real Madrid would want to sign him. I am 100% sure that they will want to sign young players with high potential such as Osimhen, Leao and Kudus (Kudus is my favourite). Salah will most likely be transferred to one of the underdog teams after playing for Liverpool for a few more years. I don't think he needs a new challenge. He is a football player who has completed his career to a large extent.
Real Madrid is focusing to sign a pure striker, Salah is a winger.
I am sure the priority of Real Madrid now is to find a new player that can replace Benzema's role/position. Benzema often gets injured, Real Madrid cannot rely on him anymore. Salah can be a striker (CF), but it is not his ideal position. So, I think Salah isn't the best option for Real Madrid. Real Madrid current target is a player like Harry Kane or Victor Osimhen. Real Madrid still has enough wingers, they have Vinicius, Rodrygo, Asensio, and Hazard. Signing Salah only wastes money.