R. Shlomo Aviner is opposed to the prenup and says the Religious Zionist rabbinite is opposed to it as well on numerous grounds, including potential ?? ????? and multiple other grounds.
Rav Aviner: The Chief Rabbinate Remains Strongly Opposed to Pre-Nuptial Agreement
Here is a translation of another related teshuva from Rav Elyashev (Kovetz Teshuvos vol. 1 #174):
http://www.theyeshivaworld.com/coffeeroom/topic/men-withholding-a-get#post-566490