Hello, we have many users using a variety of page builders (well, of them).To my knowledge, we do not have currently any issue with any of them, including Elementor. I had a look at our GitHub, and it doesn’t look we ever had problems with it historically.
We generally just do everything “properly” when it comes to integration with WordPress core. If the page builder is adhering to rules too, everything just works together.
So to answer your question, you should be completely fine ツ
Maybe try migrating one website first, and see if it all clicks.
If you have any other questions about migration, let us know here.
Cheers,
Pierre