I don’t have a Roli Seaboard block but in theory it should work in non-MPE mode assuming its current draw is below 500 mA.
I did spend a good deal of time about a year ago trying to get a Roli lightpad block working w/ ansible and failed - it would work for a few seconds then did something which locked up the USB stack on the module itself, requiring me to power cycle it.
I would still like to see MPE support at some point.