If you do a search for “multi camera” you will find many references to the use of multiple cameras with SGP. Probably all of these are referring to 2 or more cameras with 2 or more scopes, all taking images at the same time. In addition, each will probably has an additional camera for guiding. Works beautifully with 2 or more copies of SGP running, 1 copy for each scope/camera. I have run as many as 3 scopes on the same mount, all taking images, plus the guide camera for a total of 4 cameras all taking images.
The caveat with 2 or more image cameras is you should not dither, since that messes up the image being taken with the non-dithering scopes. You then must rely on the Cosmetic Correction routine a PI to fix the hot pixels, which actually works quite well.