My 2 cents... something to consider is how much scraping and glass cleaning you want/intend to do. With that placement, you almost certainly would have to scrape front and back glass for viewing, and probably both sides as well.

We, and I think others would agree leave the back glass unscraped, so that algea can grow there as food for critters without being really unsightly. With the tank in the middle like that, it would require some serious upkeep (or major snail cleanup crew) to maintain it.

Just my 2 cents...

Mike (& Kristy)