I also don't see the purpose of using a Palette here, either. They're useful little sidecars...say you'd like to run a couple of Maths alongside a different modular. Well, that's what the Palettes are for. I'd never consider them to be the right solution for a full system.
Pricing, also, should come into consideration. A 62 hp Palette = $299 street. Tiptop Mantis = $335. Both are powered. Both are portable (you can even get a gigbag for the Mantis...see HERE: https://www.sweetwater.com/store/detail/MantisTrBag--tiptop-audio-trans-mantis-express-bag). But while the Palette has 62 hp, the Mantis offers 208 and can easily be the core of a larger system in addition to being a stick-it-in-the-bag-and-go gigging instrument. To sum that up, 1 hp in a Palette costs you $4.82, while the Mantis comes in at $1.61. So even though it's slightly more, in the end it'll be cheaper since you won't have to get something else to expand beyond 62 hp. And in the end, this also more or less negates the need for that tile row.