I don't know about those racks or the strap positioning. I've hauled a lot of dirt bikes and a few road bikes in my vans and I don't see either as correct.
First, the racks are pointless other than keeping the tires centered. That can be done with a single cleat on the deck front wheel and rear and a velco strap through the cleat and around the rim at the deck. And, those racks won't hold the tires tight enough to keep the bike from tipping. Which, they will do with straps that are angled down from the bars to the deck. As the bars tilt the bike tilts with almost no elongation of the straps.
If you strap from above, the bike can't go anywhere unless the bike is lifted and that is taken care of by a deck cleats and velcro strap tying the rim to the cleats.
Of course, if nothing bad happens, you could park the bikes on a stand without straps or racks and drive wherever you want, but with a little trouble, those bikes will be all over the place.