These look like a festival COWs. This can be used in several scenarios.
- As mentioned above, to cover very tall building from short distance
- Cheap way to do multisector(multibeam) setup for a high capacity events.
- Cheap way to do coverage on very narrow area, like a bridge.
- I have seen a use case where operator wanted strong coverage along border but minimum interference across border. This horizontal setup was used.
more use-cases if you get creative 