For you, sure. It would probably be my preferred set up too. But that's far from the only way to set-up.
Every reliable report on this transfer has been clear that Mount is being signed as a #8. And that makes perfect sense if you accept that the intended set-up is (as
@Eddy_JukeZ notes above) akin to the one ETH previously used at Ajax and has already used with us via players like Fred/Sabitzer pushing extremely high alongside Bruno as part of the five in a 3-2-5 shape.
There's no more mystery to it than that, bar how we intend to use the back four to support the midfield, which
does need to happen if both your #8s/#10s are predominantly playing in those more advanced positions.