I think it depends on how you want to set up your sump. Some people will use rubble rock to help diffuse the micro bubbles coming from the overflow. You can do that, but it can be hard to get out if the space is tight. That's why I used baffles to diffuse the micro bubbles. Also, I wanted to have the largest refugium possible.
Since the stand I bought was custom made, the top actually comes off. I just dropped it in and still have space to store some tools,etc.
The great thing about sumps is that you can get very creative.
