I have a 6 with cracked glass and won't buy another one until 3rd party browsers can release without webkit. The net is an awful place without uBlock, which I am reminded about every time I try to surf with the ipad...
Your answer is Vivaldi, it has a built-in ad blocker that in my few years experience works exactly the same as ubo out of the box. If it wasn't for Vivaldi, I wouldn't buy an iPad because of what you described.
DNS-based blocking is the way (possibly via conditional VPN if you can tolerate the minimal latency bump).
After having tried Firefox with UBO on Android, I can’t say I noticed any difference compared to Orion on iOS.
You might try wBlock:
You can get Wipr 2 for iOS and (for me) it's been as good as uBO.
I have uBlock Origin Lite for Safari [1] on all iOS and iPadOS devices in my household. No one complains about ads anymore.
1. https://apps.apple.com/us/app/ublock-origin-lite/id674534269...