My embedded research lab is basically done.

I have space and switched 12v lines for 16 modems (I currently have 4 set up).

Everything is on 3 amp fuses, but the power system is designed for about 40 amps which is the maximum the PSU can supply.

I have 11 general purpose un-switched lines for permanent installations on the top shelf. Of those, only 4 are in active use: Freebox, PKT Mini (left of Freebox), PCEngines (top), and exhaust fan (not visible). The device immediately above the Freebox takes 19v and and two devices below take 230 AC. I'll be adding another PCEngines unit later but I need a 5.5x2.1->5.5x2.5 adapter for it. As you can see, I also have some unterminated wires at the top, I'm out of 5.5x2.1 barrel connectors.

Each modem on the lower shelf is connected to an FTDI USB serial adapter, currently I have 1x 7-port hub but I will need 2 more before I am able to host 16 modems. USB is controlled by mommy.cjdns.pkt.gg (MoM = Master of Modems), the 19v device immediately above the Freebox. That one has numerous USB ports on the back (actually front) so it is a good fit for the purpose.