Rockboard DUO 2.1 and EBS Flat patch

maybe you should contact Warwick support by e-mail for exact dimensions underneath and what power supply will fit? they're usually fast and helpful.

as for flat patch cables, I myself use Rockboard ones that are reported to be a bit slimmer than EBS. each jack protrudes from the socket at like 1cm.

 

I actually played around with a ruler and would say it's 1cm.

but don't take that as "two pedals can be away at 2cm", because generally you don't want jacks sitting really tight, so when you stomp on one pedal, it wants to pull the jack off it's neighbor. I have two pedals mounted at like 2.3cm (from jack end on one pedal to jack on other pedal) with a Rockboard flat patch cable though.