Yeah, the sizes are a little concerning. I have a regular ATX case, but the drive bays are in the lower right and limit my GPU length. The last time that I measured, several of the cards that I was interested in were too long or too close to my max for comfort.
I'm most interested in the 5070 Ti, but that just so happens to be the one that doesn't have an FE model, so I would have to pay more for a partner card and be careful which I get. Throwing another $200 into the pot for a 5080 FE is an option, though it's not very appealing to pay $1K for only 16GB.