The information on the eBay page is some what confusing as you say it says high level trigger but it lists the 12v version activation as
12V low-level trigger module: 0-4.5VDC relay connect (ON), 5.5-12VDC relays disconnect (OFF)
Which is active low ! It also requires 5.5v to 12v to switch the relays off.
So I doubt very much you will be able to drive this directly from you pi gpio.
If it were me I would do my own testing to determine how these relays activate and the voltages required to drive them.
Remember we want information.......................no information no help
The use of crystal balls & mind reading is not supported