Injector placement in a gasser is not critical for operation. This gives the location engineer complete freedom to put them in the most difficult place he can find. You could get away with just drilling and tapping holes in the intake manifold anywhere near the intake ports. One of the first injector systems, and mod kits, have just one injector somewhere near the throttle plate.

With diesels on the other hand, injector placement is probably the most important issue.