I have a 10in 10out DACs midi patchbay which is connected to the Elektrons, SP16, Squarp Pyramid, etc. and to a bunch of thru boxes (3x 6way, 1x 8way) which have the other synths connected, the DACs patchbay is great because it allows you to patch midi using 1/4” patch cords, so it is very quick and simple to reroute. The hardest part was to figure out which gear to group on the thru boxes to eliminate channel clashes and things like midi clock and physical location of the gear, but I think I ended up with the most flexible compromise that I could get most things talking to eachother. So I might want to use the Pyramid to sequence the boutique polys, the Digitakt to sync to Pyramid and sequence the modular stuff, and so on, I can set anything as master and have all the other stuff sync to it. The patchbay is essential as it has 2 outs and a thru for each of the 10 connected devices.
Here is the midi routing scheme: