Use as many of these as you need based on the drops you're currently getting. Each one should be set to 8 different items, with a different item filter set for each sorter, and the PLS towers set to the 4 items that are going into it. At max level you'll need 7-8 of these if you want to collect every item. Swap out power pole, and downgrade/upgrade belts and sorters to whatever your current tech is.