I have the aux cable set for my MX+ "Apogee/QSI/SBIG ST-402/STF-8300 Model Camera" as shown in the Paramount Manual. The input cable is attached to two 12 volt 5 amp power supplies which came with pin connectors of the right size (got them on Amazon). So that's how I get power to the devices on the mount. Mount power must still go through the original mount power supply as that is 48 volts. On the output cable you will see 2x2 female pin connections. I just bought some cheap pin to pin cables (from Amazon) and plugged them into the devices on the mount. Since I just have one camera, the focuser, the heaters and the fans that need power, I'm good to go with just that. (The hub gets power from the VersaPlate). I didn't bother with a rig runner but that's certainly far from a terrible idea, particularly if you have more than 4 devices to power.
I have a powered hub (Startech industrial) on the mount. All of the USB devices plug into the hub. I try to use the Versaplate as much as possible, but I've ended up needing to run one cable from the hub to the computer at the base of the mount for my QHY16200A. So I've still got one usb cable routed from the mount to the computer from the hub and one from the versaplate to the computer and one from the mount to the computer.
I do not like the idea of routing cables through any mount. It's fine when the mount works but if there is any tracking/guiding problem, then you have one additional element to cause problems and it's a hard one to debug and to reverse easily. I like the idea that anything that can physically cause such problems is visible to me. So my computer ended up with 3 usb cables - one from the mount, one from the hub and one from the versaplate. Only the cable from the hub ever moves.
I prefer not to have the computer on the mount. That is for two reasons. First, it's easier to attach a keyboard and monitor to a computer and work directly with it when it's near the mount and not on it. You can move the system around in the sky and not worry about cables snagging. This is a pretty small advantage for me as I haven't touched it in 6 months, I must admit. Still I like the idea that if a third party works on it, then they have a no risk method to do so. Second, it makes the choice of computer unimportant. Right now my MX+ is run by a computer I bought three years ago, as refurbished, for 250 dollars. It would not fit on the mount. It's in a little cabinet protected from the elements. If for any reason there was heavy dew or the roof failed to close, it's very unlikely that it would get wet. (I like that.)
I don't have a good picture of the system as it's out in New Mexico, sorry.