Connecting 3 Behringer modules

Pretty dumb question and I still don’t really know how to use Reddit. I have the Model D, Pro-1 and Pro-800 and use them individually for the most part. I’d like to build a rack like this to put them together and chain them or pick from one to another. I haven’t been able to find much other than a guy assembling the Behringer 3 tier frame or jams after the units are all set up. I am just curious if anyone can point me towards some forums or videos showing ways to connect them. I mainly want to know about are the rear input angles after they’re all together. I would like to know about the power supply, if there is a specific daisy chain option. Also I would like to know about if I can have one midi controller and pick from them through different midi channels.

Hope this isn’t too stupid of a question.

Thanks.