Unfortunately no,
1. In the 3 fan design(2 fan design also), when we have positive pressure inside the case, the hot air from the first fan(fan near the pcie power socket) is pushed towards the back of the case where there is enough holes for it to escape, but the last fan(near the case) sucks that hot air in, and as this fan is directly responsible for cooling the gpu core, it heats up and creates a loop
2. When the fans are at 80%+ speed(even less also), hot air(My estimate is about 20% or less) bounces off the side panel and gets sucked in by the same fan or the fan near or the next gpu's fan creating loop effect in the long run
3. Most of the AIB have backplates that also works as a passive heatshink, these back plates sits few mm from the next gpu's core cooling fan, these fans suck in all the heat(my estimate more than 50% at positive pressure and more than 80% at neutral pressure) and will heat up the gpu core even more than the first gpu, and the chain continues.
These issues do happens irrespective of the case orientation. Only solution is to take the air in at the front and pipe it out the back with no chance of air escaping, blower models are excellent at this.