I currently dock my macbook at my desk connected to a 1920x1080 monitor. Because the macbook can only run at 1280 I don't use clone mode, i have my monitor function as a extended screen but I've got the monitor as my primary display so this is a perfect way to use 1920x1080 resolution.

Now what I'm wondering is would it be possible to add a third screen into the mix? I keep the macbook under my desk and would like to utilize my second monitor and work across the 2 screens. The laptop is going to need to function as a third screen though else I wont be able to run my monitors in high resolution I think.

So I was wondering if anyone has managed to run this setup? if so please advise the cheapest way

Thanks for your time