Sorry for not following up. I tested each OTO pedal (Bim, Bam and Boum) through the DC7. In summary — and to be 100% safe — they require 2 15V ports for each pedal.
I say “safe” because the Bim and Bam both worked with only using one port.. But every once in a while, they would start to max it out. The Boum absolutely needs 2 ports. I have been running each of the pedals on two ports and have not had a single issue.