I have something similar to these. which allow the bikes to fold sideways when hung like a cheaper version of Steadyracks. Works quite well!
Edit: after the fourth attempt to make that link work I give up. Here https://www.tredz.co.uk/.Feedback-Sports-Velo-Hinge_77061.htm?source=aw&awc=6821_1681151822_b2d08850085f93bb9e61d205ccafee5a&utm_source=aw&utm_medium=323889
