The catch to under the TV cameras is it will look like you are looking
OVER the audience on the other end. The catch to over the TV placement is the opposite (basically facilitating the classic "I'm up here" scenario). The wrinkle is TV screen size vs. monitor screen size. Put it above or below a much smaller screen and that effect isn't so noticeable. Try it once and you'll quickly realize this. Or as a quick substitute to get the concept, shoot a selfie video with the phone down at about keyboard level or a bit above your head while staring ahead at eye level. Then watch the video you shoot as if you are on the other end of a FaceTime call.
The solution is counter-intuitive: try to get the phone or iPad camera roughly CENTER of the TV. Then as you look at those on the other end, YES, they will have a bit of them obscured by the iDevice, but- to them- it will look like you are looking RIGHT at them.
Solution #2: Distance helps. If you get far enough away from the TV such that it seems to be about the size of a monitor, the effect of looking over or under is better disguised. However, now you are FARRRRR from the microphones, so audio might be an issue.
I'm thinking ideal is perhaps a dedicated (smallish) camera (only) on a telescoping stick that can be pulled up to about mid-screen when one wants to FaceTime. In lieu of a new product creation, something towards the below left product for iPhone mounting TV center... or maybe use an on-hand tripod to get an iDevice in that spot... like the one shown below center?
Else, maybe a bent stick/gooseneck to loop over and down from the top of the set to get it more towards center of the TV screen (like image above, far right). Yes, you still have this hypothetical camera blocking a bit of the view of the other party... but now it's just a small camera instead of a whole phone or iPad. Of course, Apple would need to build such a thing... or allow others to build one and use the Continuity software.
