Floor vent guard for stupid robot vacuums

This is probably something I will be the only one to ever use, but eh.

We have a couple of robot vacuums. The heavy hitter is the Neato Botvac connected, but as good as it is it kind of sucks at edge cleaning. That's where the cheapo Chinese knockoff comes in - the Ecovacs Robotics Deebots. There's other 'brands' out there they look almost identical. Unfortunately they're also dumb as a sack of hammers... but they do edging really well due to the big swirling brushes they use to funnel de