Keynote multi-screen presentation

In about two weeks I have a presentation in a room where I have three separate flatscreens at my disposal. I want to use all three of them, at the same time.

Using the 2 Thunderbolt ports and HDMI port of my MacBook Pro, I have managed to connect all screens successfully. Unfortunately, that's where the hard part starts: the software. In short, I want to show three separate slides at the same time and click through them simultaneously (in other words: next slide means a new slide on each separate screen).

I see three options here:

• one slide with the with of three screens (therefore creating one big external screen)
• one unique slide on each screen
• three MacBooks, each connected to one screen: therefore I want to be able to control each MacBook at the same time.

The first option appears to be impossible, as Keynote will always try to fit the presentation on one screen. The second option has also been unsuccessful so far, as I am not able to start ánd control three slideshows at the same time on one Mac. The third option appears to be the only one possible so far, but I don't know how to control Keynote on three Macs simultaneously.

I hope you can help me out with this interesting challenge. PowerPoint is also a possibility, if that solves my problem.