Slayer training on Obby mauler?

Okay, so i was looking for info what is the best / fastest / most efficient method to train slay on obby pures.

Slayer with partner - you venom your enemy and then do 1 dmg with a mauler before NPC gets dropped

sulliuscep cutting - fossil collecting

Cannon + melee wildy tasks


Fossil island method looks like sweet spot where you don't get any combat xp and slayer xp/h should be somewhat "decent"?

Slayer with partner would be probably fastest but you need to play with 2 accounts and have high slayer main

And cannon with melee should be in the middle of fossils and slay partner method but would fuck up range levels if i want to stay low combat (?)

I never tried any of the methods above so any advice is welcome!