Ive used the 3 screws method before, straight up into the filter, and outside of the center 1" or so to avoid the mounting boss
just be careful down there.
I recall reading where someguy used the screwdriver through the filter method and cracked the engine case down there.
"A little inaccuracy sometimes saves a ton of explanation."
- H. H. Munro (Saki) (1870-1916)