I have a Strymon Zuma on a rack shelf. The Zuma is slighly higher than 1U though, if that makes a difference. 24v is going to be the wildcard, probably with any of these solutions. The Zuma has two outputs that can be switched to 12v, and I suppose you could use a doubling cable. That would only give you a single 24v supply though, and it would depend on what the current draw is on your device. Each output on the Zuma is 500ma @ 9vdc.