A bedroom rearrangement displaced the Dell Sound Bar attached to the streaming music player from its accustomed perch, so I conjured a mount from the parts bin to hang it from a shelf:

The sound bar originally fit below any Dell monitor with the appropriate lugs under the bezel, but a bit of bandsaw work and hand filing produced a reasonable facsimile from an aluminum sheet:

The bar’s plastic bits require a few millimeters of clearance above the sheet, now provided by a matching plywood shape:

A trial fit showed all the parts would fly in formation:

A laser-cut cardboard template maintained alignment and spacing while I stood on my head screwing the mount in place.
All’s well that ends well!