This post probably belongs in the Neato forum with other mods for Neato.
One old model featured upward directed exhaust from a curved floor behind the grill, apparently abandoned.
I suspect to do this properly, major surgery is needed on the Botvac
exhaust panel, supplying upward slanted vents with vanes inside. Things on the back could interfere with charging contact and will get bumped against furniture. I can imagine engineers with 3D printers making a replacement for the vent area, destroying part of the original casing to mount it. It might be possible jury rig something out of thin stiff plastic cut to fit and mounted with wire supports or something inside. Affects on air flow need to be considered.
See the Mods & Repairs list in the Neato forum for links to disassembling the Botvac
When I looked at this once the existing exhaust did not seem to move anything on the floor, but hair was not tested.