It should be no problem.
If either have speakers inside they may be sheilded on one side only and might cause interference with the other (in which case remove the speakers).
The only other thing is that when first turned on the degaussing coil of one may affect the other, but you shouldn't even see this since they're both still turning on.
If you notice any discoloration or geometic problems after placing them together, simply degauss each of them a couple times and see if that helps. If not, then something else may be magnetized (highly unlikely) and needing attention.