I did this on my Golf a while back, ordered the struts from ECS, installed them before work in the parking lot. All I did was remove the old struts, turn the ball joint brackets 180 degrees and install the new struts. No coding, no adjustments, no fuss. Just hold the hatch open button on the remote and it opens, or, press the VW symbol and it opens.
Something to note: when you remove the old struts the hatch is extremely heavy...get someone you trust (lol) to support it for you, or get something reliable to hold it up, maybe a piece of wood or something. I tried supporting in on my shoulder while I worked and that was less than ideal and somewhat dangerous. Even after you install one of the new struts the one new strut will not support the weight of the hatch.
Also: It DOES take a fair amount more oomph to close the hatch with the new struts. I don't mind it, but some people would.