It has been tested that the Mann Provent catch cans perform the best in terms of filtration compared to the metal catch cans such as the HPD or SEPR8R. But note that the Mann Provent catch cans have a fine filter inside (which is what makes them perform better than the metal catch cans which do not have this filter) and this filter does need to be replaced every 40-50,000km or so. And they cost about $80.
Many places sell the Provent kits to suit the Amarok and other popular utes, but I got my gear from Western Filters in Sydney and they have been good to deal with on the various occasions I have purchased parts from them.
Volkswagen Amarok 2017-2019 3.0L V6 TDi550 - Mann Provent Oil Catch Can Kit OS-PROV-29 - Western Filters
Western Filers also sell the pre filters you are asking about. Looks like they have 2 options. I don't have any experience or feedback on these, but im sure there are reviews and videos on YouTube doing tests on them which should help you.
Volkswagen Amarok 2.0L 2011-on TD 120-132kw - Fuel Manager Pre Filter Water Separator Kit FM603DPK - Western Filters
Volkswagen Amarok 2017-on 3L V6 TDi550 PreLine Direction-Plus PreLine Diesel Prefilter Kit PL643DPK - Western Filters
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