My a/c just happens to have a cover bolt right in the middle at the rear between the two vent swivels that I was able to route the zip tie around not interefereing with the vents. The zip tie doesn’t really hold very much weight if any but just lifts the net enough that nothing falls out when braking.
Now! 2007 Pleasure Way Plateau (06 Sprinter T1N)
Formerly - 1992 VW Eurovan Westfalia Hightop
Long ago - 1969 VW Westfalia & 1973 GMC Motorhome