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You really want a carrier-phase-tracking L1+L2 receiver on each end for that sort of usage which isn't inexpensive (yet).

The beacons also could be adopted by future indoor projects of theirs... that would be really nice. My roomba gets lost easily when it starts getting dark out.

It could work and that plus an IMU is what we were doing at my now recently defunct lawnmower startup. For us to have the precision we needed we had about a 3500$ setup to do so.

Didn't all the jostling of driving over terrain mess with the IMU?

Not really, we were using an IMU with a magnetometer and it was reasonably stable when it was setup correctly. As well as calibrated well. That with the GPS made things stable enough that it was at least a very good demo.

Very cool!

Combine with an outdoor surveillance system and use the cameras to track and correct the mower's position.

I had considered just some ir lights on the ground and on the mower. Then have a drone hover over the lawn and process the video for positioning.