Per the diono their carseats can touch/brace the front. They don't have to, but can. We had it rear facing in a Liberty with no problems. I *think* it touched the front seat. But that's one of the reasons we bought that particular seat. It has steel in it, and has a ten year expiration. We *did* buy the angle adjuster for it when it was rear facing. I think those are 10-15 dollars? Again, it's a narrow seat which frees up room in the back.
If you can find one at a local store they will usually let you place it in your car to see how it fits. I ordered ours online when there was a sale. Or, if you don't have a Renegade yet...I don't see why the dealership wouldn't let you bring your carseat in to see how it fits. Seems silly if they wouldn't.
I just went out and measured from the back of the seat in the Liberty to the back of the front seat where we have it set. And then in the Renegade. I actually have an extra inch in the Renegade from where the Liberty's seat was set. And have room for the Passenger to still move their seat forward and be comfortable. So I don't think it'd be an issue?