From the (admittedly very little) I've sign of this guy, I'd imagine if we did sign him he'd predominantly play as a right-back. I know there have been successful centre backs on the shorter side but generally speaking I'd say he'd probably be too small to play as a centre-back in a back four in the Premier League. The way Ten Hag's sides play often involves one of the full-backs tucking in to form a back three anyway (or even stepping in to join the midfield), and this would be very doable with Timber as a right-back and Shaw on the left.
None of what I've said is in any way to discredit his ability, by the way. Again, I must confess I have seen very little of him, but I was really impressed. Seems extremely composed, very solid positionally, a good athlete and excellent on the ball too. I could see him working out really nicely as a right-back with a bit of training if Ten Hag manages to implement a successful system here.