Is this JiffyDos modules ready to insert into C64 and 1541 or should I need any soldering.
All the 1541-IIs I have seen had the ROM in a socket already, however, this may not always be the case. The ROM chip is U4 so you should probably check it first if you want to get one.
For C64, it is quite random whether it is socketed or not. From the ones I have seen it has mostly been soldered in, so it is a bit of work to remove it and put a socket in it. Again, it may be in a socket already and it is easy to check.