I just took a 2U rack shelf and drilled 4 holes in it to match the Kemper's feet. I took the rubber feet off the KPA and screwed the Kemper onto the shelf. The shelf then mounts into a rack. Works great!
You still using the Stealth? I just sold mine in favor of the Fryette Power Station.
The MBritt Bletchley profiles sound GREAT with a tube power amp and guitar cab.