1. No, there will be no impact. The application is locked on the day you submit it. If you move out, if permanently or fore the foreseeable future, you should inform IRCC of the change of country of residence, so that when you application is approved, you will be asked to submit your passport for the PR Visa and COPR. If you are leaving Canada for a short duration, you do not need to inform. However, be advised that if your COPR is issued, you may have to apply for PRTD if you are not in Canada to return, as upon the issuance of signed and stamped COPR, all other visas are cancelled.
2. The BOWP is only for a PA. For dependents they will have their own SOWP / visitor's record / Visa etc.