There are some characters from TNG who cross over into DS9, and one of the main characters in DS9 has a grudge against one of the characters in TNG due to events in TNG, whose effects offscreen relative to TNG are explored onscreen in DS9, for example. However, there are small flashbacks that act as explainers in DS9 for those who haven’t seen TNG, and the story focuses on the impact to DS9 characters and their motivations, so you might only have half of the story for those small details, but you’ll have the half that is relevant to the story that DS9 is trying to tell. You could easily watch the one or two TNG episodes involving Wolf 359 if you wanted to get the other side, though you could make do without, and come back to TNG after DS9 if you wanted afterward.

It’s hard for me to be entirely unbiased myself, as I watched the the original series (TOS) films without watching much of the OG series itself, and then watched TNG when it was airing, so I already had the context to watch DS9.

All of that is to say, I don’t think you necessarily need to watch TNG to appreciate DS9. The shows are mostly standalone and self contained. Also, I don’t think this is much of a spoiler, as the double episode premiere of DS9 pretty much includes all of what I’ve said above, in some form or fashion, with the exception of the introduction of some character crossovers of the TNG cast. I think it’s nice to know where those characters came from and what they went through prior to DS9, as the two shows were running concurrently, but neither show is written in such a way that you’ll feel lost if you don’t watch TNG first, though others may disagree.