Can we put a P.O Box for the addresses on the I-129F form? For the petitioner and beneficiary?

Both of us will likely be moving during the K-1 process and we were wondering if putting a P.O box would be best as UCSIS does not update the beneficiary's address and petitioners might not be updated before the case is updated.. For question 2 on the I-129F can we put a P.o Box? and for question 15 can we put a p.o box? Any help would be greatly appreciated.