If you have a flat screen TV mounted on the wall and want to rotate through multiple dashboards, here are some ideas:
If you're driving your TV with a computer that can run Chrome, generate a read only link for your dashboards, load them into tabs in Chrome and then use an extension such as Revolver to rotate through the tabs.
Both plugins have the option to reload the page every time it is shown. Make sure to disable that.
The reason you should use shared links is that you don't have to use login credentials. So any time the computer needs an upgrade or a reboot all you have to do is open the bookmarked dashboards. If you are planning on using a different device like a Raspberry Pi or an Android mini PC you can use Taberific.