Apart from the others suggestions. Make sure that it does work with extensions like I don't care about cookies. That one is usually easy but make sure it works

Apart from the others suggestions. Make sure that it does work with extensions like I don't care about cookies. That one is usually easy but make sure it works with the uBlock script too. Do not have that the banner force any site reloads. Analytics for example can be loaded into a page wihtout reloading. If that is done the ad blocker users will never notice the banner.