Since I have a peninsula, I thought that was essentially the best choice for me since I needed to be free of plumbing from three sides. My tank has been running for over 4 years and I have never had to need to clean/vacuum the overflow box as there's no detritus or anything to clean. I do every 6-9 months wipe the hard water build up on the teethe and make sure nothing stuck in the strainer on the full siphon. I'm just anal about that but it's not needed.
I wouldn't rule out not having them installed. If I were to do it again, I may have added 6" additional box on my end of the tank, maybe. Here are some pictures for visual.
good luck with your set-up - it's exciting getting a new tank!
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I love that damn fish man.