FWIW: I use a cheap tablet, that I connect to the laptop with wifi - laptop in hotspot mode. Works great! I had a couple of use cases for which the web UI did not meet my needs so I made a custom webUI that does meet my needs - see link below.
One drawback is that the laptop needs a working internet connection for hotspotting to work. That has never been a real issue for gigs - I once had to connect the laptop to 4G internet on my phone but that was not the end of the word.
https://community.cantabilesoftware.com/t/example-of-webui-customisation/4452/2
Recently I do without the tablet; I use the web UI on the laptop - for my needs that works a lot better live than the Cantabile GUI.