Question on the Headrush FRFR output

Longtime 65 DRRI user here and thinking about going full ampless. I purchased an HX Stomp and put it on my board for just mod effects and built amp/cab model patches just in case my amp ever went down during a gig but am intrigued with going ampless.

How are people using their FRFR? The Headrush intrigued me as I was thinking of going Board -> Headrush FRFR as a monitor -> Mixer because I saw the FRFR has an output. Is that how people are making their signal path or do they mostly use the output to hook up to another FRFR?

And as a more macro question.. how has everyone's experience been like with other band members using real amps and one going through the PA? In my head it sounds weird but I've never tried it in practice.

Thanks!