I received a request as well and they listed stuff I could send including residential lease agreement, life insurance etc but stated it is not limited to that. So I believe what you have should be sufficient. I had an issue adding my name to anything my husband has because everywhere we went they said its not possible because I am on visitor status. I submitted the additional proof including joint bank statements, mails from the bank and government agencies, amazon deliveries, pictures, life insurance, letters from family and friends, letter by my spouse along with a letter explaining the issues I faced in adding my name to anything via webform Oct 9 and I have not received a response however I logged into my gc key yesterday (Oct 16) and it said "application/profile updated" but when I checked the application I did not see any changes. It still said they are awaiting additional documents from me and when I returned to the main page it reverted to "your action is required". I assume that means they have received the documents I sent.
Hope this helps. Good luck