When selecting a projector for projection mapping, there are a lot of options and variables to consider. The LFC works with 0.5-2.0 throw ratio projectors and focuses beyond 1.5 ft. The max distance and size would depend on the projector you use with it - the projector minimum focus distance will be your limitation.
The best resource for finding the right projector is Projector Central. Here is how to use it to find a projector that is compatible with the LFC and meets your use-case and budget requirements.
View projectors by LFC's compatible throw ratio by doing a search like this one
Please note - There are multiple search options that might help you narrow down your search (e.g., number of lumens, throw ratio range, price).
Choose a projector from the search results and visit the specs page for that projector to find the minimum throw distance, e.g. this Optoma projector has a min throw distance of 1.3 feet.
Finally, using Projector Central's calculator, enter in the name and model of the projector you've chosen to determine how large the scene can be & from what distance. Here is an example of how you'd determine projector placement for that Optoma: