Hello and welcome to the forum,
Yes for inland apllicants sponsor and applicant should be living together in Canada, biometrics are required but you don't pay the fee upfront, they'll request biometrics later in the process when you submit the application
For proof of living together, a temporary resident can do lots of things in Canada without even being asked/having no problem: can be added to rental lease as an occupant, can have a joint bank account (TD bank is good), can get a drivers licence, can be added to utility bills, can be added to life/home insurance, work benefits ..
Best of luck to you too