My reading of the evidence has led me to the conclusion that adult rehabilitation wards would be an apropriate place to implement safewards.
Whilst many adult rehabilitation units are often open and 'community facing' the patients who are placed in such environments have long histories and multiple complex needs, many will be detained. They often have had experience of coercive practices, either in acute or forensic wards. Other rehabilitation units, including the one I work on in the North East of England, (high dependency) have much in common with acute wards and so I think the safewards interventions would be readily transferable.
I would be interested to hear about safewards experience in adult rehabilitation.