PPR: Questions about where to send documents and mailing address

[OrchidMoon]

Hi everyone,
I recently recieved the RFV email and I am wondering where I should mail my documents.

I am from a country that does not require a visa to visit Canada just an ETA. However, I will be traveling to the US to see some family within the 30 day period I have to send in my documents.

My question is since I will only be mailing a copy of my passport, can I use my family member's US address as my temporary mailing address for CIC to mail my COPR to? And can I mail my documents to the address provided for those with a US mailing address? Or, do I need to mail my documents to the designated Visa office for my country and provide a mailing address in my country and have my CoPR mailed there?

Thanks for any help you can provide!