Wallwarts and cordwarts suck.   I had a rack chassis lying about, so...

Two space x 14" deep chassis left over from 1978.

Rear panel IEC inlet feeds fuse post and pilot
light on front panel, which in turn are hard-wired to power strip.

Three threaded rods run transversely through chassis.
Two lengths of aluminum angle clamp cordwarts in place.
Small block of (whatever is handy) is taped atop
wallwarts to fill space between wart and lid.

Rubber grommets have since been installed in exit
holes.  Second power strip has been installed too.