I am investigating upgrading my 5.1 system to a 5.1.4 system to support Atmos music. Using the Atmos speaker layout tool at Cinema-tools.com It turns out that for my room the positions for my 4 height speakers is at the wall/ceiling boundary. So I do not need in-ceiling speakers. I would be looking to mount standard bookshelf type speakers on articulating mounts that would allow me to point the speakers at the MLP. Finding mounts is not hard. Finding speakers with threaded inserts on the back to support installation on mounts is much more challenging. Most of what I find are pro- audio speakers. I am looking for known recommendations for speakers that fit this use case. Thanks for any insights.