I discovered the (German made I think) - Velo hinge (not cheap - mk1 is £25ish if you shop around, but the latest version is £45ea). Still it worked for me in the space we had - and all the modern bikes we use are neatly stacked and folded away - with the two Scott eBikes - mounted underneath using an old pair of "Mountain Ledge" crank arm holders (if anyone remembers those from the '90s) . A good use of the limited space there to store 7 bikes), I was pleased with the solution (but probably not the cost of finding 5 matching Velo hinges).

