Any suggestions for good monitors to use in a vertical orientation? I notice that the LG monitor they sell at Apple stores (the smaller one) cannot be rotated o

Any suggestions for good monitors to use in a vertical orientation? I notice that the LG monitor they sell at Apple stores (the smaller one) cannot be rotated on its stock stand. Maybe one can achieve this with a VESA mount + arm? But that's an expensive monitor. Any suggestions for others? High DPI would be nice, I'm so used to it.