Regarding this Victsing Keyboard: It's hard to find anything about this board, but it looks like this isn't even a mechanical keyboard. More like a cheapish rubber-dome board.
If you wanna have more of a "rubber dome" feel, you wanna have something without pretravel. E.g. Gazzew Bobba U4T
Additionally, silent switches don't bottom out as hard as normal switches, so they feel a little more "rubber dome"in that regard.
The further the bump is in the middle, the less noticeable it will become.
So just that I understand: Why exactly do you want to have it in the middle? What does it give you?