Verd. I have one of these and you are right it needs to be stand alone. It gives you the chance to grow stuff that might be out of place elsewhere. Mine currently is fairly simple with coreopsis, gallardia, bronze pansies, yellow tree peonie.red lychnis, red heucheras. I also have a "red" phlox which turned out to be pink and jars the senses. Haven't the heart to move it. Don't risk anything which isn't truly HOT.
Go for it