No need for a glass box. Just let the bottom of the screen hang in the sump. And it is silent.
Effectiveness. Depends on your lights. Size, depends on if you will have lights on only one side or both. Actually both sides is not nice, need to clean one side at least, then next time the other. And you end up pressing the one side dry while cleaning the other side.
Scrubber screen, I used carport shadecloth. Strong enough and works.
Most important thing on scrubbers. They must be easy to take apart to clean. Else they just becomes a hassle. And it is another thing that must be cleaned every week. Also, be able to take them out without dripping water everywhere.
They work, yes, and the advantages are there. Currently I do not have one.