The main consideration from a legal perspective is that the bay kombi seats are not capable of load bearing on the seat back and are not rated to do so, most newer seat backs in vans and wagons etc are, so the straps are not allowed to ride over and put pressure on the beck of the seat. In an accident the seat back can break making the child seat loose and you have a big problem. Mine touches but puts no pressure on it so is ok, some baby seats make full contact so if the anchor point is directly below the seat back, the straps go over the seat back and put constant strain on the seat. The same baby seat in our Nissan Xtrail goes down directly behind the seat and actually angles towards the front of the car, so is fully in contact with the back seat.
Cars with mounts attached to the back seat have stronger mounts on the floor for the seat as well as a stronger structure internally.
The other consideration is access. The plates need fitting from the rear so unless the engine is out and/or the fuel tank cover is removed and this still makes it hard, mounting further back is simpler. Yes it impacts on load space but not by much, no more than an anchor point in a hatch back where it is attached right at the back below the tailgate lip. And there are plenty of other spaces to stash stuff in a Kombi.
My anchor points are not as far back as those pictured, probably more towards the front of the engine cover just next to the front most corners on both sides plus just in front of it in the centre.
mnsKmobi wrote:helbus wrote:We have two mounts in our bus. They need to be far enough back that the strap angle is not too sharp. The approved bolt anchor fitting kits are available from any car parts or baby supplies shop.
These mounts are about 25cm from the rear opening, and 33cm from the side.
Are you sure there is a requirement for the strap angle? I put mine almost straight down which replicates what is in my Corolla wagon and doesn't impinge on the room behind the rear seat. This seems to comply with the ADR Figure 6. Some cars seem to have the mounting point on the back of the seat.
http://www.comlaw.gov.au/Details/F2012L00703