No recommendation from my side, either. But there's no way to control them from within the WiiM Home App.
I'm trying my best to not agree with
@Mr Ee (looks like he's getting used to it just a tad too much

), but I have to. And if you skip the WiiM Mini and the WiiM Pro, then the next streamer to combine with any amp was the WiiM Pro Plus. From my point of view there's too little to be saved in comparison to a second WiiM Amp.
Even if you hide the amps away in a closet, two WiiM Amps are less clutter than one WiiM Amp and a WiiM streamer (with an external PSU) plus any dumb power amp (with another external PSU).
Just my personal opinion, of course.