So the LTC6241HV has a noise spec of 7nV/rtHz typical, 10 max. Two in series would give you about 10 typical/14 max, discounting any additional noise from the output stage. This would be about 6dB more noise than a JFET such as a J201. You also get a low impedance output stage for "free." As RuudNL says, not the way I'd have done it, but functional. You could maybe drop in e.g. an OPA1642 and get 3dB less noise.