We already did many projects like that and it is quite similar to video projections: If you need to cover a larger space, you combine several projectors. It's the same with lasers: You can split-up the graphics in several parts, that can be handled by different laser projectors then.
Please ask if you need support in doing such kind of split-up projections. It's not too tricky, but in fact needs some knowledge.
We recommend to use the RTI units for highest end graphics applications, as these are very precise in scanning and accurate in beam.