I think a geared straight strut Through the table would be better, if you're adjusting the table surface, and it would keep the center of the table free for mousing.
Horizontal bars like in your drawing would need tracks in the keyboard or tracks in the table.
OVERALL, i don't think tenting the table is a good idea, because a split keyboard has more versatility if its tenting solution is all enclosed one piece.
For example, if I'm doing regular text work, I have the mouse in the middle and the 2 halves to both side.
But if I'm doing a typing game, I put the two haves together, center in front, and the mouse doesn't matter, because it's a typing game.
And if I'm gaming, I might have the half on my left, and the other half further out to the right, because I want that mousing space..
So, if you tented the table, you'd have a fix center line down the middle and it's not versatile for the many potential situations that you'd be working/playing with.
I would say a straight screw strut through the entire board on the outer edge is the most straight forward all one piece motorized solution.
motorized tenting may not be a huge improvement here,
It would be more easy to do this with 2 sets of magnetic legs.
You have a 40 degree tenting set, for when you're slouching, and a 60 degrees set for when you're upright.
You could do it as an engineering exercise.. but it's outside of being practical.