If a phone or laptop share the same IP, you're tracked by all of these data brokers who have their trackers installed on a majority of the top 10,000 websites in the US.
But there are multiple people with multiple devices in the household, which throws a lot of noise into the equation. In addition, I have my browsers on my devices pretty locked down.
I'm sure there is some leakage, but it's significantly reduced. There's no way to go online without any risk, and even those "off the grid" are still tracked to some degree.