Not sure I love the idea of a wood frame rack for turntables. But if very well implemented, it could be fine. And the ones you've picked do look quite solid.
What worked for me was a rack architecture that’s as rigid as possible, with isolation delegated to the shelves. My case was an extreme though, as I went from a flimsy Lovan Sovereign stackable 3-post rack (AWFUL) to an over-the-top CMS Maxxum (wonderful!). Boy did that solve my turntable feedback issues, though. You definitely want a 4-post rack, not 3, and avoid non-fixed stackable levels! I cringe whenever I see a nice table atop one of those VTI modular racks, because I know what that was like :(
Eyeballing those options, I like the Symposium for its solid aluminum posts.