Touch panels, iPad, Air Manager, Spacedesk sanity check

OK, so 2 votes for popout manager. So in theory if I have 2 iPads (size notwithstanding) I can throw the Garmin panels onto there & use the knobster (or DIY knobster) to control knobs? I assume I still need Air Player on the PC side…
Do touch screen monitors gain me anything over an iPad other than size?