Funny how things turn out. I was drilling holes to put up my Hercules wall hangers and the plastic handle of the Hercules three guitar stand disintegrated there and then, dropping two basses and a guitar to the floor. Email to them tomorrow I think.
Back to the hangers. I tried one Geefix. Don’t like them one bit. A lot more fiddly to install and there is some flex in the bracket. I used these ones in the end - much happier with these. I think I will eventually go with the timber batten option and the Hercules brackets with the flat metal base.