The 4 bolts in the middle are for installing the Axiom stand.

The feet decouple the speaker from the mounting surface. Removing them may cause your stand to resonate.

There appears to be adequate room below your monitor. The bottom of my monitor is 1/8" away from the top of the 160.

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