All.
None of those are designed to be "Installed" like that.
If you really have no other choice in the long run, you need to identify dedicated in-wall speakers which are designed for that infinite baffle effect.
Proper set up:
You should have an absolute minimum of 6" from wall to back of speaker. 18" would be preferable. Same for the distance from any side wall, if possible.
The tweeters on the ML Motions are not known to have the best dispersion, so you will need to toe them in towards your Listening Position. If you sit in the middle, you should still be able to see a very little bit of the inner sides of the L/R speakers.
The center channel should be ideally put on its own stand. Something like these, for example:
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...And it should be aimed at your head and shoulders, ideally, as you are sitting.
For the Subwoofer, I always recommend the Subwoofer Crawl to learn about and identify the best performing locations in your room where the Sub will have the most effect.
Do the Subwoofer Crawl. It's the easiest way to find the proper placement location for your subwoofer to get the best performance and sound.
www.audioholics.com
***Watch the video
Of course, it is your system, your room. That said, if you want the gear to perform to its possible best potential, then these criteria ar some basics that will help.
Also, remember to run your room correction when you make changes. Keep speakers set to small, with an 80Hz Crossover to begin with, perhaps 100Hz for the Center. Follow instructions for setting the subwoofer gain.
You will hear a completely different sound than you are currently experiencing.