Power supplies that are really good for music modulars, like the excellent Intellijel powered bus boards, have too much high frequency hash on the rails–which shows up as visible fuzz/lines/bands in video synths’ outputs.
General purpose switchmode supplies like the ones in the Monorocket cases should be approached very carefully by video synth users: test first, if possible.
Here’s a good primer:
https://community.lzxindustries.net/t/eurorack-case-and-power-supply-options/