Rockwool in Cloner?

I'm building a DWC cloner, 3 gallon tub with airstones. Clone stems are usually suspended inside with water drops splashing directly to the stem. What do you think of suspending a rockwool cube? with the reason being ease of transplanting and that way i can just cut some square holes in the lid.

Please let me know if you have tried it.

I am going to be doing the same thing. I think it will work fine.