Hi David,
It is not needed to have a Tuya hub, these remotes work when paired directly to Hubitat.
The single and the double clicks work as expected, however the ‘hold’ event requires to hold down the button for about 3 seconds, and is actually sent by the device after the button is released.
So all these Tuya buttons are not very convenient for use as a dimmer, and the ‘hold” action is not very intuitive. I use only the single and the double clicks.
For dimming functionality I can recommend the IKEA buttons.