Devialet on the wall

[Axel]

 Thing is, my living room is my listening room, and there's no way to accommodate any changes really, so its already fighting suspended wooden floors, hard surfaces but with a few soft furnishings like sofa/chairs, no doubt all in the wrong places - that's London houses for normal people.

IME the biggest thing hurting sound quality is the design fashion of modern rooms. The most important part of getting a good sound is the room and the speaker and listener positions in it. Loads of hard surfaces for harsh reflections and often no carpet will never sound good. You can spend a million pounds on a hifi and it will still be imperfect if the room is bare and the speaker position has to be compromised.
One thing I have found helps in reflective rooms with brightish speakers is to toe in the speakers so much that their axis crosses well in front to you. This reduces wall reflections and keeps you off the tweeter axis.

In the case of the remote (not the app the rotary volume control) I have had no problems vertically mounted. I don't know exactly how it works, but it does not use wifi (the remote worked fine before wifi was added and the hardware supplied)

I'm sure I read a post somewhere that said they worked on RF.