Dude, no sub required. You don't need on-wall fronts just because you have a 180 wall mount. With the 180 wall mount all you lose is some bass because it doesnt have to image stereo like two fronts.

I've said so much on here about the M5s - all of it so good. Axiom hit it out of the park. Blows my M80v2 away. Here is a link to my review titled "holography and black magic" part way down the page:

https://www.axiomaudio.com/reviews/index/list/product/930/

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated