You can use on-walls that are M80, M60, M5, M3 or M2. The M80s and M5s are harder to drive unless you have a 4 Ohm, higher powered-rated receiver or amp. The M3 or M2 are versatile choices.

Here's the link to all the Axiom on-walls.

https://www.axiomaudio.com/in-wall-on-wall-speakers

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