I have an optic with lower 1/3 co-witness to AR sights (magpul mbus) and a Zhukov stock. I had to add a 1/4" riser to the stock to get a perfect on-cheek sight picture without subsequent adjustment.
Since the ACR stock is angled, that might cancel out that need, but if you do an absolute co-witness or want to use CZ irons, it would be too high, and the Zhukov would be a better option