It's exciting you're looking to build credit with your spouse! Right now, we don't have a solution where you can both build credit using one rent check. We're looking into building that feature very soon.
Right now, the only possible workaround is to setup two accounts: one for you, and one for your spouse. Then, you can split the rent payment 50/50 between the two of you.
You'll have to pay the technology fee twice, but we think it's incredibly reasonable for the credit benefit you'll be getting.