HDRI ground and Environment canvasses

Sevrin

So I render using canvasses mostly, but yesterday for the first time I wanted to try using an HDRI as my only background.

Is there a way to get my HDRI ground to show up on anything but a vanilla beauty canvas?  My environment mode doesn't make a difference, and besides the "with ground" thing makes the HDRI look wacky.

Yours truly,

Puzzled