Any 4 or 6 man valise pack raft will fit with plenty of depth to spare.
We put the valise raft in the bottom of that locker, supported off the bottom, just in case it gets wet, and some (hopefully!) much more often used stuff on top. In an emergency, all that stuff is lighter than the raft, and would be hove overboard to reach the lifting straps of the raft.
Fort Lauderdale, FL