I probably misunderstood you, and I agree that a scope level is critical.
I don't feel that just any(of the many) are right for the application though.
The only version I use/will use, is this: Scoplevel Anti Cant Leveling Device
It's not fancy, some think too cheap, but I haven't had one fail yet.
It allows me to level my scope ADJUSTMENT, independent of the gun.
In fact, once set on a scope, I can move that scope from gun to gun without a need to adjust level -ever again.
I can also see it from shooting position, straight forward of my shooting eye/axis, without affecting cheek weld.
I've been waiting for & surprised that nobody has made a metal 'tactical' version, with switchable LED lighting of the bubble.
Gonna jump on that if they do it right.