It could work for you as long as the sizes are appropriate and no one is looked at as food. Several people on here keep tigs with rays and have success. I personally leave the bottom for rays even though I love big cats.
I've kept them they are fine be prepared to feed them alot!!! Mine got 26" in my 600 in about 18 months. And he could eat 1/2 lb of shrimp if you let him! Got sick of hand feeding my rays so I found him a new home!
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My tiger shovelnose (3.5-4 inches) is in a ten gallon right now but will go in a bigger tank soon, It wont eat I've tried to feed it bloodworms, Hikari sinking carnivore pellet and i put a tetra in there to see if he would eat it any suggestions.