I am looking to replace an existing 3 x 23.5" monitor setup with a new single 4K monitor.  The 43" monitors are a bit smaller than I think I would like as they are in effect 2 x 2 21.5" 1080 monitors.  While I would like something in the 48-50" range the C5519Q is close at 2 x 2 27" 1080 monitors and should be OK I think.  I do have some concern about a .315 pixel pitch. This will be on a desktop at about 30" away. 

I am mostly concerned about the DDM functionality for this monitor.  It is not clear from the DDM Manual for this product if I can use Easy Arrange with multiple sources.  It only talks about windows, not devices.  I currently have 2 computers all the time and would like to be able to add a laptop to the mix.