The safest one is boring on purpose: a single link, on a real domain with a long clean history, pointing to a page that loads fast and hides nothing shady up front. The risk with the big tools isn't their features, it's that they all share one heavily-used domain, which is exactly what platforms flag.
A link on an established domain of its own carries its own reputation, so it isn't judged by whatever the millions of other pages on a shared address are doing. That's the idea behind itsmylinks: your name on a domain that's been online since 2005, free.