I chose a Leupold VX-R 1.5-5x with Firedot in Talley rings. Lots of very good, similar choices in this thread. Low to medium power. Illuminated, simple reticle. High quality glass.
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If you look patiently on eBay you can find the version with capped turrets and not the CDS/BCD/tactical dials. Those are great for ringing steel at long distances, but for up close and personal work on a .416 you want as low a profile as possible.
Talley Rings for the CZ are excellent. Warne rings for the CZ are also very well made. Both come in either fixed screw-lock or QD level-lock options. Both have integral recoil lugs that fit the recess in the action’s dovetail.
Note, however, that because the recess is on the left side of the right handed action, the QD lever is necessarily on the right (ejection) side. This allows the right side to open and close over the dovetail base while using the recoil lug on the left to serve as the repeatable index for maintaining zero.
Levers up, levers down, or levers opposing inward are all viable, preferential options. I like mine pointing down toward the stock because they seem “least snaggable” in this position, but the internet is made for arguing so feel free to do so.