No, no, no, a thousand times no for the "grid style". We used to call these "wheelbenders", BTW.

Using these as intended with a U-lock, all you can lock is the front wheel. A flip of the quick-release, and the rest of the bike is gone.

Only at the outside ends can you properly lock a bike to these. Inside the rack, you can't u-lock the frame to anything without draping the bike over the top. And then you can't u-lock a wheel to anything.

And don't even start with, "Yeah, but a cable lock…" Might as well use dental floss for all the security cable locks provide.