dual dimmer he's talking about is a decora type with two sliders that look like a full size slider split in two and gives you independent dimmed circuits.
I have both a regular and C-L Credenza cord dimmer for testing purposes.
To save yourself time, do the testing on bench whenever possible.
If they get along, they work as you would want them to. Some works
if not, you might see it right away. Crazy flashing or output jumping around noticeably
If it's slightly incompatible, you might see flicker every couple minutes or only in a certain spot, or when something else is powered on/off in the house, such as the fridge kicking off.