multitail over ssh AND sudo

This question: https://unix.stackexchange.com/questions/302559/multitail-over-ssh helped me to multitail from a remote location. But my problem is one step deeper: I need to run "sudo su" before I can tail the files. How can I change user to su before I tail the file with multitail -l "ssh dev-04 tail -f /opt/app/app.log"