Best practice for patching snakebite pinch flats on skinny tubes
Use the thinnest conventional (tube-of-glue type) patches you can find.  They should be the type with feathered edges.  A little overlap is OK, but trim the edges if there will be a lot.
Better still, swap in your spare tube.
Better still, don't let your tires go flat.


(Avoid using large patches as they won't expand as the tube expands.)