You'll want to keep the scope as low as you can because the comb height on those stocks is pretty low. Warne and Leupold make scope 1in & 30mm rings specifically for the CZ 527's and I've use both on my 527's. I think the Leupold rings have a cleaner look to them but I actually prefer the Warne's and they seem to keep the scope a bit lower. Warne and Leupold both have medium height rings for the 527's and that is pretty much the lowest set of rings you'll be able to get for one of these. James Calhoon used to make a set of scope rings that was a little lower for these 527's but I believe James only did them for 1in scope tubes. Don't use the CZ rings they're not only heavy as hell but are way to tall.
This is one of my 527's with Warne med. rings and another with Leupold 30mm medium rings.