I do 2 dirtbikes on a regular basis but have only had 1 roadbike.
I am guessing the bikes will physically fit but it will be hard to secure them via normal bar straps as the bikes will be too close to the side of ute to allow the straps to be pulled tight without rubbing and possibly cracking the fairings. The holden option tie down hooks go in the floor so will make this angle worse for carrying bikes. ANd take up floor space.
I use the marouk industries VE ute tie down rails and they are definitely stronger than the stock sheet metal rubbish.
Send 'em an email and ask for a 'special price.'
JJW