Thanks again for pointing these out. As you mentioned , they are much cheaper then my triple 8 JTR surrounds and should integrate nicely. Might just have to pick four of these up in the next few months as I upgrade to AtmosThey are around 250-275 a piece, so they aren't dirt cheap but it's all relative. They are less than 1/3rd the price of a JTR Single 8, but less performance, of course.
Honestly, if you want in-ceiling compression drivers and an integrated back box, these are probably your only choice in the market.
Like anything else, there are always cheaper solutions.
I don't think atmos mixes will use those overhead channels for just background noise. There will be specific parts of soundtrack and objects using the overhead speakers.