Another pain point with the fitting of this was the angled wedge - it does not sit flush with the back mounting plate. Reason being that the screws used to fit the wedge to the wall is sticking out too much.
You probably have it upside down. I did this at first, also, until I realized what I'd done. The side that the mounting plate mates with has 2 little pegs that mate up with 2 little holes in the mounting plate. Everything fits nice and flush when using the correct side.
And if I am being picky, I would like to see a 20-25° angle wedge being offered as a separate product.
If you can get it in the UK, this one works perfectly with the reolink wedge. The holes all line up great. You can flip the reolink wedge for more/less angle that is added to the adjustable angle of the Wasserstein. I can get some pics later, if you like, that show what I'm talking about.
EDIT: added pics