I do not know for certain, but "it will probably work just fine" to connect this card via a passive x1→x16 riser.
It is not a high-power device: it has a small passive heatsink that just gets warm, not hot, to the touch.
PCIeX1 cards are allowed to draw up to 10 Watts from the slot's own power pins (https://en.wikipedia.org/wiki...).