I fly an Epsilon 4 and retrofitted it with the E5 paramotor risers.
As was said, the trimmers are intended to fly PG free flying disabled and hooked through your biner.
They can be flown free or motor in either hang point and the only benefit of either is to make adjustment for variation in hang height.
In my experience they are equivalent to speed bar in speed increase, they simply act back to front versus front to back with regard to AOA adjustment. The effect is the same.
They were surprisingly cheap and worthwhile purchase, although they did not come with a pullied and thumb looped split A as the E4 risers had. Miss that a bit when grabbing ears.
They were 100 Euro from Advance.
I was concerned they may have been tailored for the E5 specifically, which is a different breed of glider then the E4 so asked advance about AOA @ trim variation, to which they said:
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."Edit: I am 100kg, my kit all up and full 14l wet is 50kgish (homebuilt RR clone) so I'm 20kg over on my E4 31. It flies hot anyway, but trim speed is about 40k and I've seen 55 on full trimmer when full (GPS) with this wing loading. I can cruise for 3.5 hours though ignoring thermals and enjoying the view on cruise. Check manufacturer specs on fuel burn @ rpm - on the mini2 it's roughly 2.2 l/hr @ 5500rpm. Every kit's different but I recommend the E5 pmotor risers regardless.