Fail enough..
As far as rotating monitors .. the issue is not if it's digital or analog.. the issue that I see is that it shouldn't be done in the first place!
Rick gave us an interesting demo that shows what happens when a monitor is rotated (while on!). The purity goes out of whack! The monitor needed to be degaussed and in many cases, the tube needed to be reconverged!
Rick was telling us, when he tunes monitors, he makes sure that the tube is facing east/west (to lower the effects of the earth's magnetic pole). Also, when he builds monitors to south america, he has to physically create magnetic sources around the monitor to emulate the different polarity!
After this demo, I truly believe that monitors were not ment to be rotated in a single cab. You'd be much more satisfied in terms of color purity, and video quality if you owned 2 cabs (1 horizontal, and 1 vertical).