If your plan is to control your rig through Team Viewer, you need output on one of those cards (if you set as primary display), so the system will be working on the right resolution. If you didn't plug any output, you will get the small display and maybe dropping your hashrate (AMD cards issue).

Plug dummy output on a card with dropped hashrate.

Tips: just quote the point would you replying or asking, don't quote all of the posts.