This skimmer uses an airstone to produce skimate. IMO
they will work but the stone gets clogged up really fast and you need to buy a new air stone. Go with a venturi skimmer or one with a dedicated pump you won't regret it. They are pricier yes but well worth it.
But considering that you don't really need a skimmer I would get this if I were in your shews because it's so cheap and judging by the reviews moderately effective. Better water never hurt too bad.
Skimmers work by greating micro bubbles that travel up a tube and as they do so proteins attach to them and those proteins further attach to low molecular weight substances in the water (nitrate, phosphate ammonia etc). The bubbles float up to the top and are collected in the skim cup. This skimmer sits in the sump.