There's a paucity of mixers offering CV panning on 3 or more channels. The most compact is probably the Verbos (14hp) Scan and Pan, followed by PanMix (16hp), Praga (20hp), Stereomix 2 from Toppobrillo (24hp), Poltergeist (28hp), and finally WMD's 40hp Performance Mixer.
The Verbos is limited in that it has only 2 outputs. The PanMix also has only 2 outs, and you have to choose between VCA and panning on each channel. I think Praga hits the sweet spot with VCAs, independent outs, and CV panning on all 4 channels. It also has 2 aux sends, 2 stereo aux returns, and its expandable.
I think this is one of the biggest holes in the Eurorack module market. I think if Bastl ever upgraded their Quattro Figaro to do 4 channels of CV panning in 10hp they'd sell a ton.